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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.

Evaluating the Effect of Stop Bar Setbacks at Signalized Intersections

Colorado
Signalized intersections with stop bars set back 40 to 50 ft. from conflicting traffic, depending on posted speed, had substantially fewer broadside crashes. U.S. and Australian data analyzed using Broadside Safety Performance Functions and network screening indicated 40 to 50% reductions.
AASHTO Safety Summit 2026 Poster

Arizona Virtuous Cycle of Safety – Traffic Data to RSA to Design Changes

Arizona
ADOT uses a continuous feedback loop in traffic safety. Crash and driver behavior monitoring develop road safety audit (RSA) candidate locations. RSAs develop recommended design changes. Approved recommendations are designed into roadway projects. New designs are then monitored for crash and driver behavior. Full circle.
AASHTO Safety Summit Poster 2026

Camera and LiDAR-Based Near-Miss Detection for Roadside Responder Safety

Alabama
This study used ASAP truck cameras and LiDAR to analyze roadside near-miss incidents, finding many drivers neither moved over nor slowed down. The real-time detection framework supports Move Over Law enforcement, driver training, and evidence-based responder-safety policy evaluation.
AASHTO Safety Summit Poster 2026

Advancing Safety Analysis with the AASHTO Highway Safety Manual 2nd Edition

AASHTO
Coming soon: The Second Edition of the AASHTO Highway Safety Manual. The updated manual is a collection of the latest methods for incorporating quantitative safety analysis into the development of highway transportation projects. Learn what’s new and how it differs from the first edition.
Advancing Safety Analysis with the AASHTO Highway Safety Manual 2nd Edition

Minnesota TZD E-Bike Webinar

Minnesota
Minnesota DOT, its Toward Zero Deaths program, the Minnesota Departments of Health and Public Safety brought partners together to talk about "everything e-bikes:" safety, EMS implications, policy, and educational programming. The webinar was funded by NHTSA and hosted by the University of Minnesota's Center for Transportation Studies.
TZD Traffic Safety Hotdish: Everything E-Bikes — Exploring Policy, Safety, Programming, and Research

Advancing Transportation Safety in Colorado – A New Approach to Implementing a Strategic Highway Safety Plan

Colorado
Colorado introduced an annual action planning and refining process to SHSP implementation. The action plans allow Colorado DOT to respond to changes in transportation safety and adapt over the 5-year SHSP period.
AASHTO Safety Summit Poster 2025

A Unified Framework for Safe System Implementation

California
Caltrans developed a safe system framework that adds hierarchy to strategies and incorporates context into decision-making.
AASHTO Safety Summit Poster 2025

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
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