Case Study Tag: Intersections

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DelDOT’s Road Design Manual

Delaware
The DelDOT Road Design Manual includes key changes in road design practices with several new and updated policies and guidelines geared toward creating a safer, more multi-modal roadway network.
Road Design Manual Website2024 Safety Summit Poster

WISDOT’s Approach to Reducing Intersection Crashes

Wisconsin
Intersection safety improvements and data enhancements prioritized effective safety countermeasures, leading to improvements at 175 intersections.
Intersection WebpageICE ResourcesSafety Certification ProcessAASHTO 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

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

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

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

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
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