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The influence of speed limits on roadway safety is an extremely importantsocial issue and is subject to an extensive debate in the State of Indiana andnationwide. With around 800-900 fatalities and thousands of injuries annuallyin Indiana, traffic accidents place an incredible social and economic burden onthe state. Still, speed limits posted on highways and other roads are routinelyexceeded as individual drivers try to balance safety and mobility (speed). Thisresearch explores the relationship between speed limits and roadway safety.Namely, the research focuses on the influence of the posted speed limit on thecausation and severity of accidents. Data on individual accidents from theIndiana Electronic Vehicle Crash Record System is used in the research, andappropriate statistical models are estimated for causation and severity ofdifferent types of accidents on all road classes. The results of the modelingshow that speed limits do not have a statistically significant adverse effecton unsafe-speed-related causation of accidents on all roads, but generallyincrease the severity of accidents on the majority of roads other than highways(the accident severity on highways is unaffected by speed limits). Our findingscan perhaps save both lives and travel time by helping the Indiana Departmentof Transportation determine optimal speed limit policies in the state.

Influence of Speed Limits on Roadway Safety in Indiana