Optimization of vehicle and pedestrian signals for isolated intersections

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Title: Optimization of vehicle and pedestrian signals for isolated intersections
Author(s): Yu, C
Ma, W
Han, K
Yang, X
Item Type: Journal Article
Abstract: In most traffic signal optimization problems, pedestrian traffic at an intersection receives minor consideration compared to vehicular traffic, and usually in the form of simplistic and exogenous constraints (e.g., minimum green time). This could render the resulting signal timings sub-optimal especially in dense urban areas with significant pedestrian traffic, or when two-stage pedestrian crosswalks are present. This paper proposes a convex (quadratic) programming approach to optimize traffic signal timings for an isolated intersection with one- and two-stage crosswalks, assuming undersaturated vehicular traffic condition. Both vehicle and pedestrian traffic are integrated into a unified framework, where the total weighted delay of pedestrians and vehicles at different types of crosswalks (i.e. one- or two-stage) is adopted as the objective function, and temporal and spatial constraints (e.g. signal phasing plan and spatial capacity of the refuge island) are explicitly formulated. A case study demonstrates the impacts of incorporating pedestrian delay as well as geometric and spatial constraints (e.g., available space on the refuge island) in the signal optimization. A further analysis shows that a two-stage crosswalk may outperform a one-stage crosswalk in terms of both vehicle and pedestrian delays in some circumstances.
Publication Date: 3-Jan-2017
Date of Acceptance: 24-Dec-2016
URI: http://hdl.handle.net/10044/1/43588
DOI: https://dx.doi.org/10.1016/j.trb.2016.12.015
ISSN: 0191-2615
Publisher: Elsevier
Start Page: 135
End Page: 153
Journal / Book Title: Transportation Research Part B - Methodological
Volume: 98
Copyright Statement: © 2016 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Keywords: Traffic signal optimization
vehicle and pedestrian delay
spatial constraint
quadratic programming
isolated intersection
Logistics & Transportation
1507 Transportation And Freight Services
0102 Applied Mathematics
Publication Status: Published
Article Number: TRB_1719
Embargo Date: 2018-07-03
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering



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