US-31/M-72 had frequent fog, blowing snow, and a severe crash pattern. After adding a center median, edgeline and centerline corrugations, guardrail, new pavement, and a flashing low visibility warning system, the segment had less severe crashes.
Concerned with rural intersections crashes, MnDOT developed a standard layout of lane constrictors. They installed lane constrictors at 61 side street, stop-controlled locations.
Montana DOT observed a significant increase in wrong-way driving and severe crashes. Working with law enforcement, maintenance, and traffic and safety, they installed a new wrong-way driving flashing system.
NCHRP Synthesis 639: Implementation of Federal Highway Administration Proven Safety Countermeasures
NCHRP
This report describes DOT practices and challenges in adopting of FHWA proven safety countermeasures. The research includes recommendations like more inclusion of maintenance personnel, outreach and training.
Texas DOT’s combined CMF calculator tool calculates the combined reduction factor of multiple countermeasures (which provides HSIP funding documentation). The full tool is accessible to district staff.
Systemic Countermeasures Implementation and Tracking
Virginia
Virginia DOT created a statewide inventory and tracking system for the performance of countermeasures, leading to better communication among employees and partners, and the ability to track ongoing progress.
A Collaborative Investigation of Truck Access into Roundabouts in Oregon
Oregon
Oregon DOT used field and simulation methods to understand and mitigate delays experienced by motor carriers in roundabouts, highlighting potential for improvements to better accommodate large vehicles.
