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FHWA Highway Safety Programs

Guidance for the Setting of Speed Limits (Report to Congress)

The Report summarizes the findings on how speed limits are set, from the National Cooperative Highway Research Program (NCHRP) Project 17-76, “Guidance for the Setting of Speed Limits.” The NCHRP Project 17-76 research team investigated the factors that influence operating speed and its impacts on safety. In addition, the research team conducted a thorough review of different methods and tools that have been developed for the setting of posted speed limits.