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Title:Safety Analysis and Crash Modification Factors of an Adaptive Signal Control Technology along a Corridor
Author(s):Osorio, Jesus J.; Benekohal, Rahim (Ray) F.
Subject(s):Crash Modification Factor
Safety Performance Functions
Highway Safety Manual
Adaptive Signal Control Technology
SynchroGreen
Abstract:The main objective of this study is to determine the safety effectiveness of the adaptive signal control technology (ASCT) SynchroGreen using an observational before and after study applying the Empirical Bayes (EB) method. Both national (HSM) and state specific (Illinois) safety performance functions (SPF) were selected and calibrated for the local conditions. A total of 14 SPFs from the HSM and 3 additional from Illinois were calibrated and crash modification factors (CMF) were developed. For multiple-vehicle fatal and injury (FI) crashes at all intersections (four-legged and three-legged combined), the CMF was 0.67, which was not statistically significant at 95 percent confidence level (it was significant at 87 percent). For four-legged-only intersections the CMF was 0.67 as well, which was not significant with 95 percent confidence (it was significant at 85 percent). The 87 and 85 percent are not confidence levels used in practice, however they clearly indicate a decreasing trend in FI crashes due to the implementation of ASCT. For PDO and total crashes, all CMF computed were very close to one indicating no crash reduction due to the implementation of ASCT. The CMF for Illinois KAB crashes (fatal, type A injury, and type B injury crashes combined) was found to be 0.68, which was not significant at 95 percent confidence level (it was significant at 71 percent indicating a decreasing trend in these types of crashes). Paired t-test results showed no reduction in sideswipe same direction, turning, and type
Issue Date:2019-01
Publisher:Illinois Center for Transportation/Illinois Department of Transportation
Citation Info:Osorio, Jesus J., and Rahim (Ray) F. Benekohal, 2019. Safety Analysis and Crash Modification Factors of an Adaptive Signal Control Technology along a Corridor. A report of the findings of ICT-R27-127. Illinois Center for Transportation Series No. 19-001. Research Report No. FHWA-ICT-19-001. Illinois Center for Transportation, Rantoul, IL.
Series/Report:FHWA-ICT-19-001
Genre:Technical Report
Type:Text
Language:English
URI:http://hdl.handle.net/2142/103134
ISSN:0197-9191
Sponsor:IDOT-R27-127
Rights Information:No restrictions. This document is available through the National Technical Information Service, Springfield, VA 22161.
Date Available in IDEALS:2019-03-05


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