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Michigan 70 MPH Speed Limit Essay

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found that the average speed had increased along urban interstate, rural US highway, urban US highway, and rural state highways by 8,4,7, and 5 mph, respectively. Crashes were grouped into the following biases: (fatal crashes), (fatal and incapacitating crashes), (fatal, incapacitating, and capacitating crashes), and (all types of crashes with different injury severity). However, property damaged only was discarded for the study. It was found that 15 months after speed limits had been changed, all types of crashes on rural interstate increased by 16 percent, on urban interstate all types of crashes increased by 28 percent, and on US and state highways all types of crashes increased significantly. Additional factors that may have influenced …show more content…
The 500 miles were designated to study the impact of a new speed limit on crashes over a six month study period; the study was conducted by Taylor (Taylor and Maleck, An Evaluation of the Michigan 70 MPH Speed Limit. 1996). The study did not discover significant speed changes before and after the speed limits were changed and there was insufficient data to determine the safety impacts. In 1997 MDOT raised the speed limit along an additional 1000 miles of rural freeway. After this change a comprehensive study was conducted by Taylor (Taylor, The Impact of Raising the Speed Limit on Freeways in Michigan, Final Report (two volumes). 2000) on the 1500 miles where the speed was raised. This study included data from 1997 through 1999. A before and after study was implemented to examine the impact of speed limit change. It was found that all types of crashes increased by 10.5 percent. Recently, the potential impact on the anticipated speed limit changed from 55 to 65 mph on non-freeway was studied by Gates et al. (Gates, et al. 2015). The study predicted an annual increase of 40.3 fatal crashes, 74.6 incapacitating crashes, and 631.8 property damage

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