title: Safety evaluation of intersections with dynamic use of exit-lanes for left-turn using field data.
abstract: As a newly proposed unconventional intersection design, the exit-lanes for left-turn (EFL) intersection is found to be effective in increasing the intersection capacity with high level of application flexibility, especially under heavy left-turn traffic conditions. However, the operational safety of EFL is of most concern to the authority prior to its implementation. This paper evaluates the safety of the EFL intersections by studying the behavior of left-turn maneuvers using field data collected at 7 locations in China. A total of 22830 left-turn vehicles were captured, in which 9793 vehicles turned left using the mixed-usage area. Four potential safety problems, including the red-light violations, head-on collision risks, trapped vehicles, and rear-end crash risks, were discussed. Statistical analyses were carried out to compare the safety risk between the EFL intersection and the conventional one. Results indicate that the safety problems of EFL intersections mainly lie in higher percentages in red-light violations at the pre-signal (1.83% higher), wrong-way violation problems during the peak hours (the violation rate reaches up to 11.07%), and the lower travel speeds in the mixed-usage area (18.75% lower). Such risks can be counteracted, however, by providing more guiding information, installing cameras to investigate and punish violation maneuvers, and adjusting design parameter values for layout design and signal timing, respectively.
authors.affiliation: Department of Traffic Engineering, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai, PR China. Electronic address: jing_zhao_traffic@163.com.
authors.forename: Jing
authors.initials: J
authors.lastname: Zhao
authors.affiliation: Department of Civil and Environmental Engineering, University of Wisconsin at Milwaukee, P.O. Box 784, Milwaukee, WI, United States. Electronic address: liu28@uwm.edu.
authors.forename: Yue
authors.initials: Y
authors.lastname: Liu
mesh_terms: D000063:Accidents, Traffic / Q000331:legislation & jurisprudence / Q000517:prevention & control / Q000706:statistics & numerical data*; D001334:Automobile Driving; D002681:China; D004779:Environment Design; D006801:Humans; D035846:Law Enforcement; D012307:Risk Factors; D012449:Safety / Q000592:standards*; D014741:Video Recording
keywords: Exit-lanes for left-turn use; Field data; Safety evaluation; Signalized intersections; Statistical analysis; Unconventional design