Case Study Filter: Speed

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Safe Truck Mobility for North Dakota Winter Roads

North Dakota
North Dakota Highway Patrol and North Dakota DOT studied crash risk and travel disruption due to severe winter storms through a Safe System lens. They found several proactive opportunities for safe truck mobility during winter storm events.
Research ReportResearch BriefTRID Record2024 Safety Summit Poster

Get Involved with Transportation Research Board (TRB)

NCHRP
NCHRP and BTSCRP develop resources for DOTs, transportation professionals, and other agencies. Resources include research related to the AASHTO Highway Safety Manual and AASHTO Manual for Assessing Safety Hardware, safety guides for practitioners, and behavioral research. Transportation professionals may contribute problem statements, conduct research, contribute to TRB Standing Committees, and volunteer for project panels.
NCHRPBTSCRPTRIS2024 Safety Summit Poster2025 Safety Summit Poser

DelDOT’s Road Design Manual

Delaware
The DelDOT Road Design Manual includes key changes in road design practices with several new and updated policies and guidelines geared toward creating a safer, more multi-modal roadway network.
Road Design Manual Website2024 Safety Summit Poster

American Samoa Road Safety

American Samoa
The rugged terrain and high-sloped roadsides of Pacific islands is prone to rockfall, landslides, and tidal waves. American Samoa employs a variety of strategies and traffic devices to improve safety.
Highway Safety Plan 2024-262024 AASHTO Safety Summit Poster

Natural Bridge Avenue Safety Project

Missouri
The Natural Bridge Ave road diet and safety project reduced speeds by 17%, reduced all crashes by 75% and fatal pedestrian crashes by 100%.
Project WebpageAASHTO Case Study

Safe System Approach Applied to GDOT Policy

Georgia
A revision to GDOT policy requires inclusion of vulnerable road user safety in setting speed zones.
Northeast Georgia Regional Commission ArticleAASHTO Case Study

Minnesota Avenue SE Between 27th Street SE and A Street SE

District Columbia
Minnesota Ave SE safety improvements such as curb extensions, bus bulb-outs, median refuges, parking setbacks, and protected bicycle lanes reduced crashes by 34% and injuries by 44%, with average speeds declining by 50%.
DDOT Bicycle LanesAASHTO Case Study

High Friction Surface Treatment to Mitigate Wet Pavement Crashes

Arkansas
High Friction Surface Treatment (HFST) reduced wet pavement crashes by 83% for fatalities and serious injuries and 68% for all crash types.
ADOT Safety CountermeasuresResearch Problem StatementAASHTO Case Study

Work Zone Speed Safety Cameras

Pennsylvania
The Pennsylvania Department of Transportation (PennDOT) noted a marked reduction in excessive speeding since adding speed safety cameras to work zones
Work Zone Speed Safety Camera ProgramAASHTO Journal Article
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