United States Department of Transportation
i
Effectiveness of Dynamic Speed feedback signs, Volume I: Literature review and meta-analysis
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2021-08-01
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[PDF-1.74 MB]
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Edition:Final Report
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Abstract:This study uses published research to perform a comprehensive, quantitative review of the effectiveness of dynamic speed feedback signs (DSFSs) where effectiveness was measured by vehicle speed reductions. In 2019 over one-quarter (26%) of all fatal crashes were speeding-related, and speeding-related vehicle crashes cost society hundreds of billions of dollars each year. Lowering excess speeds to reduce these human, societal, and economic costs is therefore a major focus of safety officials and highway engineers. This study focuses on DSFSs, which present drivers with real-time feedback on their speed. This report presents evidence that DSFSs can be effective in reducing mean speeds, 85th percentile speeds, and the percentages of drivers over the speed limit in a range of contexts. Across all types of vehicles and different installation locations, the clear majority of studies found significant reductions in speeds at the DSFSs when the DSFSs are activated. Overall, reductions of 4 mph at the DSFS were estimated for passenger vehicles as a result of DSFS installation, and reductions between 2- to 4 mph at the DSFS were estimated across all vehicle types in the different contexts assessed. As reductions in speed of just a few mph can significantly reduce injury from crashes, these effects demonstrate that DSFSs can be effective tools in saving lives. This reported is accompanied by a second volume, Effectiveness of Dynamic Speed Feedback Signs, Volume II: Technical Appendices and Annotated Bibliography.
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