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Although numerous publications have studied the safety effects of speed limit policy, the topic continues to be the subject of lively debate. On July 1, 2005, the speed limit on rural interstates in Iowa was increased from 65 mph to 70 mph. This research first conducted a before–and-after study on rural interstates and other facilities to study the effects on safety performance in Iowa due to this speed limit change. The study explored the impact of the speed limit change on two effects known as the “speed adaptation” and “spillover” effects. Research was also conducted on traffic citations issued on the rural interstate because citations may be a surrogate measure for highway safety. Finally, research was conducted on the recent increase in the retail price of gasoline and its effect on driver behavior.

The 70-MPH speed limit: speed adaptation, spillover and surrogate measures of safety