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原文传递 Safety Evaluation of an Adaptive Signal Control Technology Using an Empirical Bayes Approach

题名：	Safety Evaluation of an Adaptive Signal Control Technology Using an Empirical Bayes Approach
正文语种：	eng
作者：	Kodi, John H.;Kitali, Angela E.;Sando, Thobias;Alluri, Priyanka;Ponnaluri, Raj
作者单位：	Florida Int Univ Dept Civil & Environm Engn 10555 West Flagler St EC 3720 Miami FL 33174 USA;Univ Washington Tacoma Sch Engn & Technol 1900 Commerce St Tacoma WA 98402 USA;Univ North Florida Sch Engn 1 UNF Dr Jacksonville FL 32224 USA;Florida Int Univ Dept Civil & Environm Engn 10555 West Flagler St EC 3720 Miami FL 33174 USA;Florida Dept Transportat 605 Suwannee St MS 90 Tallahassee FL 32399 USA
关键词：	Adaptive signal control technology (ASCT);Signalized intersections;Crash modification factors (CMF);Empirical Bayes (EB)
摘要：	Adaptive signal control technology (ASCT) is a traffic management strategy that optimizes signal timing based on actual traffic demand. Although meant to improve the operational performance of signalized intersections, such mobility enhancements may translate into substantial safety benefits. This study examined the safety effects of ASCT using an observational before-after empirical Bayes (EB) approach with a comparison group. The proposed approach was used to develop crash modification factors (CMFs) for total crashes, angle crashes, rear-end crashes, and specific crash severity levels [fatal or injury (FI) and property damage only (PDO) crashes]. The analysis included 42 treatment intersections with ASCT and their corresponding 47 comparison intersections without ASCT. Findings from the study indicated the potential of ASCT to improve the safety of signalized intersections since the CMFs for both ASCT systems (InSync and SynchroGreen) showed significant reductions in crashes. On average, the deployment of ASCT was found to significantly reduce the total, rear-end, FI, and PDO crashes by 5.2%, 12.2%, 4.2%, and 5.7%, respectively. These results were consistent between the two systems. Also, a 2.1% reduction in angle crashes was observed, although the reduction was not statistically significant at a 95% confidence level. The findings from this study provide researchers and practitioners with an effective means to quantify the safety benefits of ASCT and conduct an economic appraisal of ASCT systems.
出版年：	2022
期刊名称：	Journal of Transportation Engineering
卷：	148
期：	4
页码：	04022008.1-04022008.12