00819920

Component

https://doi.org/10.3141/1748-05

http://scholar.google.com...acks&publication_year=2001

A stochastic signal optimization method based on a genetic algorithm (GA-SOM) that interfaces with the microscopic simulation program CORSIM is assessed. A network in Chicago consisting of nine signalized intersections is used as an evaluation test bed. Taking CORSIM as the best representation of reality, the performance of the GA-SOM plan sets a ceiling on how good any (fixed) signal plan can be. An important aspect of this approach is its accommodations of variability. Also discussed is the robustness of an optimal plan under changes in demand. This benchmark is used to assess the best signal plan generated by TRANSYT-7F (T7F), Version 8.1, from among 12 reasonable strategies. The performance of the best T7F plan falls short of the benchmark on several counts, reflecting the need to account for variability in the highly stochastic system of traffic operations, which is not possible under the deterministic conditions intrinsic to T7F. As a sidelight, the performance of the GA-SOM plan within T7F is also computed and it is found to perform nearly as well as the optimum T7F plan.

This paper appears in Transportation Research Record No. 1748, Advanced Traffic Management Systems and Vehicle-Highway Automation 2001.

English

p. 40-45

2001

Transportation Research Record

0309072077

Figures (5) ; References (13) ; Tables (2)

Genetic algorithms; Microsimulation; Optimization; Stochastic programming; Traffic signal control systems; Traffic signal timing; Traffic simulation; Travel demand; Variables

CORSIM (Traffic simulation model); TRANSYT (Computer program)

Robustness

Chicago (Illinois)

Highways; Operations and Traffic Management; I73: Traffic Control

TRIS, TRB, ATRI

Nov 2 2001 12:00AM

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• COMPARISON OF TRANSIMS AND CORSIM TRAFFIC SIGNAL SIMULATION MODULES
• CONFIGURATION MANAGEMENT IN TRANSPORTATION MANAGEMENT SYSTEMS: EVALUATION OF NEED
• FREEWAY CRASH TIMELINE CHARACTERISTICS AND USES
• FREEWAY PERFORMANCE MEASUREMENT SYSTEM: MINING LOOP DETECTOR DATA
• METHOD FOR REAL-TIME RECOGNITION OF VEHICLE PLATOONS
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• OPTIMAL COORDINATED RAMP METERING WITH ADVANCED MOTORWAY OPTIMAL CONTROL
• PEDESTRIAN TIMING ALTERNATIVES AND IMPACTS ON COORDINATED SIGNAL SYSTEMS UNDER SPLIT-PHASING OPERATIONS
• REAL-TIME OFFSET TRANSITIONING ALGORITHM FOR COORDINATING TRAFFIC SIGNALS
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