Accurately diagnosing the causes of crashes allows transportation professionals to select the most effective countermeasures. TRB hosted a webinar on Tuesday, November 4, 2025 from 12:00 PM to 1:30 PM Eastern that presented tools and methods for conducting diagnostic assessments and selecting countermeasures within the Safe System framework. The session emphasized the importance of understanding human factors, behavioral influences, roadway conditions, and user interactions when choosing treatments to address crash types and road user needs. Presenters discussed how to differentiate between human factors and driver behavior issues, assess contributing factors to crashes, and identify countermeasures that align with underlying causes.
This webinar was based on NCHRP Report 1111 & BTSCRP Report 12: Diagnostic Assessment and Countermeasure Selection: A Toolbox for Traffic Safety Practitioners.
This webinar was sponsored by TRB’s National Cooperative Highway Research Program and Behavioral Traffic Safety Cooperative Research Program.
The slides are available. Please visit the webinar details page to access the recording.
 
Webinar agenda and presenters

• Framework and toolbox for diagnostic assessments in the Safe System – John Campbell, Exponent
• Procedures and decision trees for countermeasure selection in the Safe System – Darren Torbic, TTI
• Real-world applications and benefits to the traffic safety practitioner – Ida van Schalkwyk, Washing State Department of Transportation
• Question and answer session moderated by Richard Retting, Transportation Research Board

The first 60 minutes of the webinar were for presentations and the final 30 minutes were reserved for audience questions.
 
Learning Objectives
At the end of this webinar, participants can:

• Describe the differences between human factors and driver behaviors as they relate to crashes
• Assess key human factors issues that contribute to crashes
• Identify and select crash countermeasures matched to underlying contributing factors

 
Professional Development Hours
This webinar was delivered as a scheduled – e-learning live event and is categorized within RCEP as Technical, Health and Safety.
Professional Development Hours (PDHs) earned on completion of this program were reported to the Registered Continuing Education Program (RCEP). Certificates of Completion are issued to all participants via the RCEP.net online system. Complaints about registered providers may be addressed to RCEP, 1015 15th Street, NW, 8th Fl., Washington, DC, 20005.