Case Study Tag: evaluation

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High Friction Surface Treatment on Vertical Curves

West Virginia
HFST on vertical curves reduced wet weather crashes by 84%.
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%.
ReportPress ReleaseLocal News ArticleAASHTO 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 WebpageVideoAASHTO 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 ArticleAASHTO Case Study

Statewide Deployment of Center Line Rumble Strips

Oklahoma
Centerline rumble strips reduced fatal and serious injury collisions by 18%.
Local News ArticleFHWA GuidanceAASHTO 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 WebsiteRoundabouts WebsiteAASHTO Case Study

Shoulder and Centerline Rumble Strips on Rural Two-Lane Roadways in North Carolina

North Carolina
Rumble strips on rural two-lane roadways reduced lane departure crashes by 30%.
Local News ArticleLocal News ArticleAASHTO Case Study

Enhancing Curve Signing on Rural Two-Lane Roadways in North Carolina

North Carolina
Enhanced curve signing reduced lane departures by 33%, total crashes by 35% and fatal and injury crashes by 41%.
AASHTO Case Study

Roundabouts at High-Speed Intersections in North Carolina

North Carolina
Roundabouts at high-speed intersections reduced total crashes by 41% and fatal and injury crashes by 79%.
Evaluation of Roundabouts on High-Speed RoadwaysRoundabouts WebpageAASHTO Case Study

All Way Stops (AWS) in North Carolina

North Carolina
All Way Stops at rural intersections reduced fatal and severe injury crashes by 92%.
All Way Stop WebpageAll Way Stop Summary BriefAASHTO Case Study
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