Case Study Tag: Safety analysis

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Iowa DOT Safety Impact Dashboard Development

Iowa
Traffic safety projects can produce varying impacts on safety performance. While some projects substantially reduce crashes, others may yield limited or unexpected measurable effects. Establishing a robust framework for tracking crash histories associated with safety projects is therefore essential for the Iowa DOT and other state DOTs to assess project effectiveness, efficiency, return on investment, and broader safety performance implications.
AASHTO Safety Summit 2026 Poster

Minnesota Comprehensive Roundabout Study

Minnesota
HDR helped MnDOT to study the safety performance of roundabouts in Minnesota. A unique aspect of this study was the evaluation of various roundabout features (such as number of legs, circulating lanes, radius, curvature, signing, etc.). The poster highlights the findings from this study.
AASHTO Safety Summit 2026 Poster

Rear-End Collision Prevention Function in Signalized intersection

Maryland
Study (pre-deployment assessment) aimed to mitigate rear-end collision risks at signalized intersections utilizing advanced lane-based, wide-range detection sensors extending Dynamic All Red Extension to optimizing the green termination time.
AASHTO Safety Summit 2026 Poster

Nebraska’s Interstate Cable Median Barrier Success

Nebraska
Nebraska implemented cable median barrier on a few segments of Interstate 80. We have observed a reduction in fatalities and serious injuries from cross-over median crashes. The poster will also include cable median barrier strike and repair stats to show the maintenance perspective with safety.
AASHTO Safety Summit 2026 Poster

Minnesota Evaluations for Rest in Red and Advance Warning Flashers

Minnesota
On an MnDOT-funded project, HDR and HSRC evaluated traffic safety strategies in Minnesota. The analysis results found statistically significant safety effectiveness for both Rest-in-Red overnight signal operations in Ramsey County and advance warning flashers at signalized intersections statewide.
AASHTO Safety Summit 2026 Poster

Florida DOT’s New Policy – “Achieving Target Zero”

Florida
Florida Department of Transportation Secretary Perdue signed the “Achieving Target Zero” policy in March 2026 establishing the elimination of all traffic fatalities and serious injuries as agency goal and setting a framework for that goal through three coordinated strategies (engineering, education, and community engagement).
AASHTO Safety Summit 2026 Poster

Advancing HSIP Effectiveness: Findings from the FHWA National Scan Tour

FHWA
FHWA conducted an HSIP National Scan Tour of six states. It showcased noteworthy practices, data-driven strategies, and challenges in safety planning, programming and evaluation, offering actionable insights to improve decision-making and advance safety goals.
AASHTO Safety Summit 2026 Poster

Analysis of the Safety Effectiveness of Rear-End Collision Avoidance ADAS

FHWA
This study analyzed the safety effectiveness of FCW (forward collision warning) and CIB (crash imminent braking) ADAS (advanced driver assistance systems) systems based on large-scale, police-reported crash data combined with decoded VINs of crash vehicles. The QIE and logistic regression were adopted to measure and compare the reduction of rear-end striking across driver and vehicle groups.
AASHTO Safety Summit 2026 Poster
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