Case Study Filter: Countermeasures

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 2024-26 2024 AASHTO Safety Summit Poster

WISDOT’s Approach to Reducing Intersection Crashes

Wisconsin

Intersection safety improvements and data enhancements prioritized effective safety countermeasures, leading to improvements at 175 intersections.

Intersection Webpage ICE Resources Safety Certification Process AASHTO Case Study

High Friction Surface Treatment on Vertical Curves

West Virginia

HFST on vertical curves reduced wet weather crashes by 84%.

AASHTO Case Study

Tennessee’s Pedestrian Road Safety Initiative: A Strategic Approach to Addressing High Risk Locations for Vulnerable Roadway Users

Tennessee

Pedestrian Road Safety Initiative (PRSI) funds projects to reduce fatal and severe pedestrian crashes.

Program Website AASHTO Case Study

Crash Modification Factors for High-Tension Cable Median Barriers in Pennsylvania

Pennsylvania

High-tension cable median barriers reduced cross-median crashes by up to 83%.

Report Press Release Local News Article AASHTO Case Study

Crash Modification Factors for High Friction Surface Treatments in Pennsylvania

Pennsylvania

High Friction Surface Treatments (HFST) reduced crash frequency by 30% to 76% at curves and intersections.

HFST Webpage Video AASHTO Case Study

Oregon DOT’s Safety Priority Index for Enhanced Crosswalks

Oregon

Safety Priority Index for Enhanced Crosswalks (SPIE-C) prioritized crosswalk investigations and improvements.

AASHTO Case Study

Installation of High-Tension Cable Barrier to Prevent Severe Cross Over Median Collisions

Oklahoma

High-tension cable barriers reduced cross-over median serious injury and fatality collisions significantly.

Local News Article AASHTO Case Study

Statewide Deployment of Center Line Rumble Strips

Oklahoma

Centerline rumble strips reduced fatal and serious injury collisions by 18%.

Local News Article FHWA Guidance AASHTO Case Study

Accelerating the Widespread Adoption of Roundabouts

Ohio

Accelerating roundabout adoption reduced total crashes by 33% and injury crashes by 71% at single-lane roundabouts.

Ohio HSIP Program Website Roundabouts Website AASHTO Case Study