Citation

Paul M, Ghosh I. Transp. Lett. 2020; 12(8): 528-539.

Copyright

(Copyright © 2020, Maney Publishing, Publisher Informa - Taylor and Francis Group)

DOI

10.1080/19427867.2019.1651571

PMID

unavailable

Abstract

Traffic conflicts at signalized intersections caused by red light violations (RLVs) present an enormous danger for severe crashes. This study proactively evaluates the efficacy of Green Signal Countdown Timer (GSCT) on RLVs and resulting right-angle and right turn related crashes (for left-hand driving) using Post Encroachment Time (PET). A before-after (B-A) with comparison group analysis is done considering five 4-legged signalized intersections from Delhi, India comprising of with and without SCT installations. RLV occurrences and maximum violation time during initial 10 s of red are more in the absence of GSCT. Considering various RLV-related characteristics, Powered Two Wheelers (P2W) are found to have the highest exposure in crash involvement for both timer conditions. Finally, B-A method shows 57.74% reduction in crossing conflicts due to the presence of GSCT at the sites. . Accordingly, SCT's installation can be recommended as a cost-effective engineering countermeasure to reduce severe crash types at signalized intersections.

Language: en

Keywords

before-after study; green signal countdown timer; post encroachment time; red light violation; Signalized intersection