Case Study Tag: evaluation

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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

Grooves of Guardianship: Unveiling the Impact of Rumble Strips

Georgia
Rumble strips reduced injury and fatal crashes by 48% on analyzed roadways.
Georgia 2023 HSIP ReportLocal News ArticleAASHTO Case Study

Minnesota Avenue SE Between 27th Street SE and A Street SE

District Columbia
Minnesota Ave SE safety improvements such as curb extensions, bus bulb-outs, median refuges, parking setbacks, and protected bicycle lanes reduced crashes by 34% and injuries by 44%, with average speeds declining by 50%.
DDOT Bicycle LanesAASHTO Case Study

Exploring the Safety Benefits of All-Way Stop Control at Low-Volume Unsignalized Intersections

Delaware
All-Way Stop Control (AWSC) at low-volume intersections reduced fatal crashes by 75% and injury crashes by 90%.
Roadway Safety Foundation Case StudyNews ReleaseAASHTO Case Study

High Friction Surface Treatment to Mitigate Wet Pavement Crashes

Arkansas
High Friction Surface Treatment (HFST) reduced wet pavement crashes by 83% for fatalities and serious injuries and 68% for all crash types.
ADOT Safety CountermeasuresResearch Problem StatementAASHTO Case Study
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