01628768

Component

One of the measures to reduce the conflicts between pedestrians and left-turning vehicles at crosswalks of signalized intersections is to provide separate phases for pedestrians and curbside turning vehicles, such as exclusive pedestrian phase (EPP) or Leading Pedestrian Interval (LPI). LPI, which displays a few seconds of dedicated pedestrian green phase ahead of vehicle green phase provides better visibility of pedestrians to the drivers of turning vehicles, and a portion of pedestrians can be protected from the conflicting turning vehicles. From the viewpoint of safety and operational performance, LPI can be positioned between the concurrent pedestrian phase (CPP) which shares the same signal phase with adjacent vehicles, and the EPP which has a dedicated phase for pedestrians only. However, the application range of LPI depending on intersection layout and traffic conditions is still unclear. Thus, this study proposes a methodology for quantitatively evaluating the change level of pedestrian-vehicle conflict risk as pedestrian green time proceeds, and in conjunction with the evaluation of operational performance, the effective application range of LPI is investigated through a case study on typical situations at signalized intersections in Japan.

This paper was sponsored by TRB committee AHB25 Standing Committee on Traffic Signal Systems.

01618707

17-04661

English

17p

2017

Transportation Research Board 96th Annual Meeting

Digital/other

Figures; References; Tables

Case studies; Evaluation; Methodology; Pedestrian clearance interval (Traffic signals); Pedestrian safety; Performance measurement; Signalized intersections; Traffic conflicts; Traffic signal phases; Turning traffic

Japan

Highways; Operations and Traffic Management; Pedestrians and Bicyclists; Safety and Human Factors

Transportation Research Board Annual Meeting 2017 Paper #17-04661

PRP, TRIS, TRB, ATRI

Dec 8 2016 11:47AM