Review of State DOT Practices for Analyzing the Effectiveness of Completed Highway Safety Improvement Projects

Mardi, 6 Juin, 2023 - 15:00

The South Dakota Department of Transportation (SDDOT) sought to enhance its safety program by investigating different methods of evaluating completed highway safety improvement projects. As a first step, the researcher completed a comprehensive literature review, using the results to develop a state survey. Upon approval of the state survey by the project’s technical panel, thirteen states representing various geographic locations and population distributions were interviewed to determine which evaluation methods they are currently using or have used in the past, what data is needed to employ each method, time constraints, staffing requirements, and what modifications, if any, they have made to any of the available methods. Next, the researcher interviewed employees from various offices within SDDOT and the Department of Public Safety to determine what resources and data elements are available to the traffic safety engineers for safety analysis. The report is available online through the US DOT National Transportation Library at


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