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State Safety Initiative Database

Explore relevant case studies by filtering via agency, keyword, or pre-set filters in the left menu, or by using the topic tags located at the bottom of the page.

Exploring the Safety Benefits of All-Way Stop Control at Low-Volume Unsignalized Intersections

Delaware
All-Way Stop Control (AWSC) at low-volume intersections reduced fatal crashes by 75% and injury crashes by 90%.
Roadway Safety Foundation Case StudyNews ReleaseAASHTO Case Study

Innovative Countermeasures to Deter Wrong-Way Driving (TRC 2105)

Arkansas
TAPCO Wrong-Way Driving Detection Systems pilot project detected and corrected wrong-way drivers, showing promising results for further implementation.
TRC Presentation 2023 (See “Resilient Infrastructure”)Local News ArticleLocal News VideoAASHTO 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

SAFER Tool for All Projects

Missouri
The Missouri Department of Transportation (MoDOT) developed a series of safety questions to be applied to every transportation project at the agency.
MODOT SAFER WebsiteToward Zero Deaths Case StudyAASHTO Case Study2023 Safety Summit Poster

Automated Vehicle Pilot Project

Hawaii
The Hawaii Department of Transportation (HIDOT) pilots autonomous electric passenger shuttles to augment existing bus service at the Honolulu airport
HIDOT Airport ProjectHIDOT University ProjectAASHTO Journal Article

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

Work Zone Speed Enforcement Cameras

Arkansas
The Arkansas Department of Transportation (ARDOT) uses speed safety cameras in work zones in partnership with law enforcement
Press ReleaseARDOT Slow Down, Phone DownAASHTO Article

Access Management Study – FM 1488

Texas
The Texas Department of Transportation (TxDOT) studied access management to improve safety on a four-lane roadway in a growing area
Study Summary Report
Safety Highlights Tags