Case Study Tag: Safety analysis

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Deployment and Safety Evaluation of Variable Speed Limits on I-70

Colorado
Deployment and evaluation of a Variable Speed Limit (VSL) algorithm on I-70 in Colorado. The flow-, weather-, queue-, and transition-based algorithm adjusts speeds in real time. An Empirical Bayes before-after evaluation found approximately 30% reductions in crash frequency and severity.
AASHTO Safety Summit 2026 Poster

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
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