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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.

Using Innovative Financing to Expedite Rural Safety Improvements

Oklahoma
Innovative financing expedited rural safety improvements, reducing project timelines and both crash costs and project costs.
Build America Package 1Build America Package 5Press ReleaseAASHTO Case Study

Work Zone Safe

Oklahoma
Work Zone Safe course for teen drivers aims to improve work zone safety.
Work Zone Safe WebsitePress ReleaseAASHTO 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
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