An unconventional design through-movement waiting bay (TWB) was emerged to improve the traffic capacity and efficiency at signalized intersections. The TWB allows the through-moving vehicles to queue up when the green light of the previous signal phase is released. However, the safety effects of the TWB remained unknown. The objective of the study is to evaluate the safety effects of the TWB at signalized intersections using traffic conflict technique. Traffic conflicts were extracted from the video for the treatment and control sites at three signalized intersections in Nanjing, China. A hierarchical Bayesian peak over threshold (HB-POT) model was developed for the before-after (BA) safety valuation based on traffic conflicts. The model combines traffic conflicts of treatment and control sites as well as before and after periods for the treatment effect estimation. The treatment effectiveness was estimated based on the HB-POT model with the calculation of odds ratio (OR). The results showed that the overall treatment effect varies from 31.76% to 32.84% in terms of reduction in the extreme conflicts. The treatment effect indicates a remarkable improvement in safety after the implementation of TWB at signalized intersection. Moreover, the spatial analysis result shows the safety benefits of TWB on optimizing the traffic conflict distribution.
Before-after safety evaluation of TWB at signalized intersection based on traffic conflict technique
Y. Guo et al.
Journal of Transportation Safety & Security
Journal of Transportation Safety & Security ; 17 , 8 ; 881-900
2025-08-03
20 pages
Article (Journal)
Electronic Resource
English
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