Case Study Filter: Countermeasures

Data-Driven Strategies Using Predictive Modeling and Interactive Dashboards

Iowa

Since traffic safety projects often yield varying impacts on safety performance, Iowa DOT established a robust system to track crash histories related to safety projects, which is essential to assess project effectiveness, efficiency, and return on investment. The system is helpful to site identification, safety issue diagnosis, and countermeasure evaluation.

Traffic safety dashboards

Pavement Marking Retroreflectivity

The Final Rule on maintaining pavement marking retroreflectivity goes into effect September 6, 2026. Agencies can use recommended methodologies to better prioritize budgets, maximize the life of pavement markings, and improve roadway safety.

Methods report MUTCD 11th edition Methodology videos

Making Safety Everyone’s Business: Integrate Safety into All Programs and Projects

FHWA has several resources and examples of integrating safety into all transportation projects, throughout the project lifecycle, from planning through operations and maintenance. They also have resources for organizational safety culture and programmatic safety integration.

FHWA Office of Safety

How SS4A can Keep Effingham County Residents Safe

Georgia

The Effingham County's Safety Action Plan, created with Safe Streets for All (SS4A) funding, is based on data analysis, public input, and stakeholder meetings.The plan highlights prioritized areas for improvement, and aims to reduce fatal crashes to zero.

Safety Action Plan Resolution

DelDOT’s Road Design Manual

Delaware

The DelDOT Road Design Manual includes key changes in road design practices with several new and updated policies and guidelines geared toward creating a safer, more multi-modal roadway network.

Road Design Manual website

American Samoa Road Safety

The rugged terrain and high-sloped roadsides of Pacific islands is prone to rockfall, landslides, and tidal waves. American Samoa employs a variety of strategies and traffic devices to improve safety.

Highway Safety Plan 2024-26

WISDOT’s Approach to Reducing Intersection Crashes

Wisconsin

Intersection safety improvements and data enhancements prioritized effective safety countermeasures, leading to improvements at 175 intersections.

Intersection Webpage ICE Resources Safety Certification Process AASHTO Case Study

High Friction Surface Treatment on Vertical Curves

West Virginia

HFST on vertical curves reduced wet weather crashes by 84%.

AASHTO Case Study

Tennessee’s Pedestrian Road Safety Initiative: A Strategic Approach to Addressing High Risk Locations for Vulnerable Roadway Users

Tennessee

Pedestrian Road Safety Initiative (PRSI) funds projects to reduce fatal and severe pedestrian crashes.

Program Website AASHTO Case Study

Crash Modification Factors for High-Tension Cable Median Barriers in Pennsylvania

Pennsylvania

High-tension cable median barriers reduced cross-median crashes by up to 83%.

Report Press Release Local News Article AASHTO Case Study