Case Study Tag: Intersections

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Improving Rural Intersection Safety and Efficiency with Dynamic Dilemma Zone Protection: Alabama Pilot Study

Alabama
Rural high-speed intersections in Alabama experienced several benefits, including 24-35% fewer red light-runner crashes, in a pilot of CWA (continuous wide area) sensors used in a dynamic DZP (dilemma zone protection) system.
AASHTO Safety Summit Poster 2025

Rounding Out Roundabouts in CT

Connecticut
Connecticut DOT formed a roundabout committee of professionals trained on evaluating the planning, design, and construction of roundabouts on municipal and state roads.
AASHTO Safety Summit Poster 2025CDTOD Roundabouts WebsiteLocal News VideoLocal News Article

FDOT’s Statewide Systemic Analysis

Florida
FDOT uses a data-driven, risk-based approach to guide systemic investments. Their systemic analysis led FDOT leadership to approve $35 million in HSIP funds, plus additional state funding for safety investments.
AASHTO Safety Summit Poster 2025

Lane Constrictor Intersections in Minnesota

Minnesota
Concerned with rural intersections crashes, MnDOT developed a standard layout of lane constrictors. They installed lane constrictors at 61 side street, stop-controlled locations.
AASHTO Safety Summit Poster 2025Evaluation Report

Crashes to Conflicts: Advancing Predictive Safety Evaluations with Lidar-Developed Near-Miss Analytics

Nevada
NDOT used a model with LiDAR-based all-traffic trajectory data to enhance pedestrian safety assessments at urban intersections. The data is helping planners anticipate and mitigate safety risks and develop precisely targeted improvements.
AASHTO Safety Summit Poster 2025Presentation Slides

Systemic Safety Countermeasures and Collaborative Approaches at GDOT

Georgia
Georgia DOT uses crash data analysis to implement proactive, systemic safety countermeasures, improve safety for vulnerable users, optimize project delivery, and target unsafe driving behaviors.
TPM Peer Exchange Video, Sep. 2024

Implementing Complete Streets in Kentucky

Kentucky
When KYTC implemented Complete Streets, they found large reductions in fatalities and serious injuries at two-way stop and signalized intersections.
KYTC Press ReleaseKYTC Complete Streets Webpage2023 Safety Summit Poster

Development and Application of Safety Performance Functions in Project Delivery

Iowa
Based on models of Safety Performance Functions (SPFs), Iowa screened roadway facilities for Potential for Crash Reduction (PCR). PCR was then applied to project screening and prioritization, intersection projects, Super-2 corridor studies, a pilot safety corridor program, and environmental assessments.
Iowa State University ArticleIowa DOT PCR Portal2023 Safety Summit Poster

Local and Tribal Match Road Safety Program

FHWA
FHWA’s Match program connects local and tribal agencies with peer mentors to help resolve local and tribal road safety issues.
Program Overview2023 Safety Summit Poster

AWSC at Low-Volume Unsignalized Intersections

Delaware
With 40% of fatalities and serious injuries occurring at low-volume, unsignalized intersections, DelDOT implemented All-Way Stop Control. After three years, there were zero fatalities and 82% fewer injury crashes at the intersections evaluated.
AWSC Crash Trends MemoRoadway Safety Foundation Case StudyLocal News ArticleSafety Summit Poster 2023AASHTO Case Study
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