Benefit

Adaptive traffic signal control strategies can reduce travel times up to 29 percent.

A review of adaptive signal control performance in the United States and other countries.


05/14/2012
Nationwide,United States


Summary Information

This paper provided an overview of commonly deployed adaptive traffic signal control systems. A literature review was conducted to detail functions and features of the five most widely deployed systems in the United States and other countries. The table below provides a brief description of each type of control system.

SystemYear (Place Developed)
Features and Methodologies
Number of Deployments
SCOOT
(Split Cycle and Offset Optimization Technique)
1970 (UK)Optimizes Splits, Cycle and Offsets; real-time optimization of signal timingMore than 200 locations worldwide; around 10 locations in the USA.
SCATS
(Sydney Coordinated Adaptive Traffic System)
1970 (Australia)Optimizes Splits, Cycle and Offsets; selects from a library of stored signal timing plansMore than 50 locations worldwide; more than 10 locations in the USA.
OPAC
(Optimization Policies for Adaptive Control)
1990 (USA)The network is divided into independent sub-networks4 locations in the USA.
RHODES
(Real Time Hierarchical Optimized Distributed Effective System)
1990 (USA)Mainly for diamond interchange locations4 locations in the USA.
ACS Lite1990 to 2006 (USA)Operates with predetermined coordinated timing plans; automatically adjust splits and offsets accordingly3 locations in the USA.

SCOOT has the largest world-wide deployment with SCATS the largest in the United States. The number of OPAC and RHODES deployments was limited. Although the number of ACS Lite systems deployed was relatively small due to its short history, the number of these systems is expected to grow as a result of its low cost and compatibility with existing closed-loop systems.

According to the literature review, adaptive systems provide significant benefits over traditional time-of-day coordination plans. The improvements are based on reduced stops, delays, and fuel consumption.

FINDINGS

The table below summarize results from field studies.

Adaptive Signal Control System
Travel Time
Delays
Stops
SCOOT-29% to -5%-28% to -2%-32% to -17%
SCATS-20% to 0%-19% to 3%-24% to 5%
OPAC-26% to 10%-55% to 0%
RHODES-7% to 4%-19% to -2%
ACS Lite-12% to 7%-38% to 2%-35% to -28%

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Source

An Overview of the Usage of Adaptive Signal Control System in the United States of America

Author: Zhao,Yi and Zong Tian

Published By: Trans Tech Publications, Applied Mechanics and Materials

Prepared by University of Nevada Reno and Beijing Jiaotong University f

Source Date: 05/14/2012

Other Reference Number: Vol. 178-181 (2012) pp. 2591-2598

URL: http://wolfweb.unr.edu/homepage/zongt/Publications_files/YiZhaoATC-Applied%20Mechanics%20and%20Materials.pdf

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Goal Areas

Mobility

Typical Deployment Locations

Metropolitan Areas

Keywords

traffic signals, adaptive signals

Benefit ID: 2014-00921