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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.

Reduced Conflict Intersections in North Carolina

North Carolina
Reduced Conflict Intersections reduced total crashes by 50% and frontal impact crashes by 80%.
Reduced Conflict Intersections 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

NCDOT Pedestrian Safety Improvement Program

North Carolina
The Pedestrian Safety Improvement Program implemented road safety audits and developed action plans for high-risk areas.
Pedestrian Safety Improvement WebpageAASHTO Case Study

Safety Design Build 1.0 and 2.0

Missouri
Design Build 1.0 WebpageDesign Build 2.0 WebpageAASHTO ArticleAASHTO Case Study

Natural Bridge Avenue Safety Project

Missouri
The Natural Bridge Ave road diet and safety project reduced speeds by 17%, reduced all crashes by 75% and fatal pedestrian crashes by 100%.
Project WebpageAASHTO Case Study

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
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