01497523

Component

https://doi.org/10.3141/2356-07

http://scholar.google.com...ohal&publication_year=2013

This paper analyzes the effects of different traffic metering levels at the entry points of a simulated signalized network to maintain efficient vehicle processing. Metering signals were placed along the network perimeter in advance of the bordering intersections to reduce the vehicle arrival rate and prevent oversaturation. In the simulation environment, traffic signals were externally controlled by independent agents using a learning algorithm based on approximate dynamic programming. Agents operated the signals in a cycle-free mode, reacting in real time to current demands and occupancy estimated from detectors placed at the entry and exit points of all links. The metering strategies were analyzed for delay, throughput, network congestion, and queue management. Results indicate that metering have a significant effect on network performance. Metering to levels just below the maximum throughput capacity of an intersection resulted in increased network throughput (up to 5%); reduced delay (up to 10.9%), including vehicles inside and those metered outside of the network; and queue lengths inside the network that allowed efficient use of green time. However, metering to points well below or above the capacity of an intersection did not always provide network improvements. This finding suggests that an optimal congestion level exists inside the network that can be achieved by a metering strategy. An analysis of the metering effects is presented in a case study, and field implementations and scenarios in which metering can be applied are discussed.

01497498

13-4294

English

pp 53-60

2013

Transportation Research Record: Journal of the Transportation Research Board

9780309286824

Print

Figures (5) ; References (14) ; Tables (1)

Congestion management systems; Networks; Ramp metering; Traffic oversaturation; Traffic signal timing; Traffic volume

Highways; Operations and Traffic Management; Safety and Human Factors; I73: Traffic Control

TRIS, TRB, ATRI

Feb 5 2013 12:50PM

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• Coordinated Optimization Model for Signal Timings of Full Continuous Flow Intersections
• Design and Evaluation of an Intelligent Dilemma-Zone Protection System for a High-Speed Rural Intersection
• Dynamic Programming Approach for Arterial Signal Optimization
• Effective Coordinated Optimization Model for Transit Priority Control Under Arterial Progression
• Estimating Queue Length Under Connected Vehicle Technology: Using Probe Vehicle, Loop Detector, and Fused Data
• Evaluation of Microwave Radar Vehicle Detectors at a Signalized Intersection Under Adverse Weather Conditions
• Experiences with Adaptive Signal Control in Germany
• Multiregime Adaptive Signal Control for Congested Urban Roadway Networks
• Performance Diagnosis Tool for Arterial Traffic Signals
• Self-Organizing Control Logic for Oversaturated Arterials
• Statistical Study of the Impact of Adaptive Traffic Signal Control on Traffic and Transit Performance
• Transit Priority Strategies for Multiple Routes Under Headway-Based Operations