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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.

J-Turns Analysis

Missouri
J-turns reduced fatal and injury crashes by 54% and right-angle crashes by 80%.
Missouri J-Turns WebpageUniversity of Missouri ArticleAASHTO Case Study

Lane Constrictor Intersection Statewide Implementation

Minnesota
Lane constrictor intersections reduced fatal and injury crashes in Minnesota by 20%.
Traffic Safety Evaluation of Lane Constrictors ReportTRB Project PageAASHTO Case Study

J-Turn Statewide Implementation

Minnesota
J-turn intersections reduced angle crashes by 67% and fatal and serious injury angle crashes by 87%.
Minnesota J-Turn WebpageJ-Turn Driver TutorialAASHTO Case Study

MD 187 (Old Georgetown Road) Quick Build Lane Reallocation to Address Bicyclist Safety

Maryland
Lane reallocation for new bicycle lanes on MD 187 reduced bicyclist fatal and injury crashes, and improved safety for vulnerable road users.
Community Meeting PresentationProject AnnouncementReport to General AssemblyAASHTO Case Study

Examining the Impact of Centerline Rumble Strips on Reducing Rural Two-Lane Head-On Collisions in Maine

Maine
Centerline rumble strips reduced head-on and opposite sideswipe collisions by 28-48%.
Research PaperRumble Strips BrochureAASHTO Case Study

Idaho’s US-20 Expansion from SH-55 to Locust Grove

Idaho
US-20 expansion and reflective backplating on signals reduced serious injury and fatal crashes by 75%.
Project Overview FlyerAASHTO Case Study

Reconstruction, Widening, and Signalization at the Intersection of West Karcher Road (SH-55) and Lake Avenue

Idaho
Reconstruction and signalization at SH-55 and Lake Avenue reduced serious injury and fatal crashes by 100%
AASHTO Case Study

AASHTOWARE Safety Powered by Numetric – Unleashing the Power of Crash Analytics

Georgia
AASHTOWare Safety powered by Numetric improved the efficiency of crash data analysis by 60%.
AASHTOWare ArticleNumetric Case StudyNumetric LRSP Case StudyAASHTO Case Study
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