Case Study Tag: Intersections

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Piloting a Research-Backed Pedestrian Crossing Treatment Toolkit

Delaware
Delaware DOT is testing the pedestrian crossing toolkit developed under NCHRP 03-143. This spreadsheet-based resource incorporates roadway context and yielding data from hundreds of field study sites to help practitioners select treatments for unsignalized intersections and midblock crossings.
AASHTO Safety Summit 2026 Poster

Innovative Rail Crossing and Intersection Safety Improvement

Florida
A highly innovative design utilizing a pear-shaped roundabout to replace three traffic signals and seven rail-gated crossing lanes in a physically constrained area. This $9.5m project located in a community with high numbers of below-poverty residents also added improved pedestrian facilities.
AASHTO Safety Summit 2026 Poster

Georgia DOT Context Classification of State Routes

Georgia
Georgia DOT developed a context classification framework for state routes. Using measures such as intersection, population, and employment density, routes are categorized into seven types—from rural and rural town to urban core. This approach supports context-sensitive design and enhances safety.
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

Lighting Design Guidelines for Pedestrian Crosswalks

Massachusetts
MassDOT is developing a a lighting design guide for crosswalks with the goal of improving the safety of nighttime crossings. The guide includes tools to help designers prioritize crosswalk lighting improvements based on crash history, risk, and pedestrian demand, supporting safer crossings statewide.
AASHTO Safety Summit 2026 Poster

A Proactive Path to Safer Roads: New Jersey DOT’s Systemic Safety Program

New Jersey
NJDOT’s systemic safety approach proactively reduces crash risk by applying low-cost, proven countermeasures across the network. The poster summarizes horizontal curve, wrong-way driving, school zones, signalized intersection, pedestrian, and bicyclist analyses using a machine learning approach.
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

Roundabout Screening Study – Seeking Good Locations for Crash Reduction

Connecticut
A roundabout intersection screening study was performed by the Capitol Region Council of Governments for the 38 communities in the Hartford, Connecticut region. The study identified locations likely to result in significant reduction of fatal and serious crashes if converted to a single lane roundabout.
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
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