01337942

Component

https://doi.org/10.3141/2264-07

http://scholar.google.com...ohal&publication_year=2011

The two objectives of this research were to develop a methodology to optimize signal timing at intersections by minimization of delay for both vehicles and pedestrians and to establish guidance for the selection of the pedestrian crossing phase (two-way or scramble) and the length of the “Walk” phase when the scramble crossing pattern was used. An optimization procedure for signal plans was developed for an isolated intersection. The procedure can provide up to four vehicular phases with either the two-way or scramble pedestrian crossing phase. Genetic algorithms were used to find suitable signal plans because of the existence of a large solution set. Furthermore, the proposed genetic algorithm procedure can generate contour diagrams as selection guides to determine appropriate pedestrian crossing phases at an intersection with different combinations of vehicle volumes and pedestrian volumes. The impacts of relative time values, initial vehicle queues, and geometric designs on the pedestrian phase selection were also determined. According to the contour diagrams, to determine appropriate pedestrian crossing phases, not only do pedestrian volumes and right-turning vehicle volumes need to be taken into account but also through (and left-turning) vehicle volumes should be considered. The scramble crossing reduced delay when the conflicting pedestrian and right-turning vehicle volumes in approaches were high and the through (and left-turning) vehicle volumes in the same approaches were relatively lower. Otherwise, the scramble phase increased delay.

01365021

11-1519

English

pp 54-64

2011

Transportation Research Record: Journal of the Transportation Research Board

9780309223010

Print

Figures (6) ; References (14)

Genetic algorithms; Minimization; Optimization; Pedestrian clearance interval (Traffic signals); Pedestrian vehicle interface; Traffic delays; Traffic signal timing; Traffic volume

Pedestrian delay; Pedestrian scramble signals; Pedestrian volume

Highways; Operations and Traffic Management; Pedestrians and Bicyclists; I73: Traffic Control

TRIS, TRB

Feb 17 2011 5:50PM

• Can Walking Behavior Be Predicted? Analysis of Calibration and Fit of Pedestrian Models
• Crossing Behaviors of Pedestrians at Signalized Intersections: Observational Study and Survey in China
• Development and Implementation of Conflict-Based Assessment of Pedestrian Safety to Evaluate Accessibility of Complex Intersections
• Do Advance Yield Markings Increase Safe Driver Behaviors at Unsignalized, Marked Midblock Crosswalks? Driving Simulator Study
• Does Proximity to Activity-Inducing Facilities Explain Lower Rates of Physical Activity by Low-Income and Minority Populations?
• Effectiveness of Signal-Based Countermeasures for Pedestrian Safety: Findings from Pilot Study
• Enhancing the Quality of Infrared-Based Automatic Pedestrian Sensor Data by Nonparametric Statistical Method
• Estimation of Frequency and Length of Pedestrian Stride in Urban Environments with Video Sensors
• Exploring Your Own Backyard: Measurement of Greenway Use in Cary, North Carolina
• Field Evaluation of Automatic Pedestrian Detectors in Cold Temperatures
• Inconsistencies of Ordered and Unordered Probability Models for Pedestrian Injury Severity
• Logistic Regression Model of Risk of Fatality in Vehicle–Pedestrian Crashes on National Highways in Bangladesh
• Modeling of Pedestrian Activity at Signalized Intersections: Land Use, Urban Form, Weather, and Spatiotemporal Patterns
• Multiobjective Optimization of Signal Timings for Two-Stage, Midblock Pedestrian Crosswalk
• Pedestrian Safety Programs in Centers of Large Cities: Institutional Settings and Identified Barriers
• Sign Visibility for Pedestrians Assessed with Agent-Based Simulation