01628782

Component

https://doi.org/10.3141/2620-09

To improve the safety of people walking at particular signalized intersections, traffic signal engineers may implement leading pedestrian intervals (LPIs) to provide pedestrians with a walk signal for a few seconds before the parallel vehicular green indication. Previous before-and-after studies and simple economic analyses have indicated that LPIs are low-cost tools that can reduce vehicle–pedestrian conflicts and crashes at some signalized intersections. Despite this evidence, municipalities have little guidance for when to implement LPIs. A marginal benefit–cost framework is developed with quantitative metrics and extends the concept of traffic conflicts and marginal safety–delay trade-offs to analyze the appropriateness of implementing an LPI at specific signalized intersections. The method provides guidance to help quantify the probability of a conflict occurring and direction on whether to implement an LPI at a given location from macroscopic-level inputs, including number of turning movements, crash data, and geometry. A case study with sample data indicated that an LPI was cost-effective for the scenario presented.

01649617

17-05116

English

pp 96–104

2017

Transportation Research Record: Journal of the Transportation Research Board

9780309441759

Digital/other

Figures (2) ; References (39) ; Tables (3)

Benefit cost analysis; Case studies; Implementation; Macroscopic traffic flow; Metrics (Quantitative assessment); Pedestrian clearance interval (Traffic signals); Pedestrian safety; Signalized intersections; Traffic conflicts; Traffic delays

Highways; Operations and Traffic Management; Pedestrians and Bicyclists

PRP, TRIS, TRB, ATRI

Dec 8 2016 11:59AM

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