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Assessing the Safety Impacts of Increased Speed Limits on Kansas Freeways

Journal of Transportation Technologies 2019年第1期9卷 56-77页

作者： Reza S. Shirazinejad Sunanda Dissanayake ahad amini pishro Department of Civil Engineering Kansas State University Manhattan USA Department of Civil and Construction Engineering Kennesaw State University Kennesaw USA Department of Civil Engineering Sichuan University Chengdu China

Suitable speed limit is important for providing safety for road users. Lower-than-required posted speed limits could cause the majority of drivers non-compliant and higher-than-required posted speed limits may also increase the number of crashes with related severities. The speed limit raised in Kansas from 70 mph to 75 mph on a number of freeway segments in 2011. The goal of this study is to assess the safety impacts of the freeway sections influenced by speed limit increase. Three years before and three years after speed limit increase was considered and three methods were used: 1-Empirical Bayes (EB), 2-before-and-after with comparison group, and 3-cross-sectional study. The Crash Modification Factors (CMFs) were estimated and showed 16 percent increase for total crashes according to EB method. Further, the before-and-after with comparison group method showed 27 percent increase in total crashes and 35 percent increase on fatal and injury crashes. The cross- sectional method also presented 25 percent increase on total crashes and 62 percent increase on fatal and injury crashes. It was seen that these increases were statistically significant.

关键词： Speed Limit Increase Fatal and Injury Crashes Freeways Safety Evaluation Crash Modification Factors

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