Washington State Department of Transportation (WSDOT)

Work Zone Speed Camera Program Evaluation

WSDOT sought a data-informed way to refine where and how speed cameras are deployed in active work zones as part of its speed camera pilot program, launched in partnership with Washington State Patrol and other agencies. This project supported that effort by developing a framework for evaluating camera siting and deployment practices using field observations, site characteristics, speed data, crash history, and before-and-after comparisons of active and inactive camera operations. The work also considered whether driver-behavior indicators, such as acceleration, hard braking, trajectory patterns, and near-miss or telematics data, could help assess work zone safety beyond traditional speed measures. The resulting framework was intended to help WSDOT identify deployment practices that improve its ability to evaluate and predict the safety performance of work zone speed cameras as the pilot program continues to unfold.