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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.

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

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

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
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