Costs for adaptive signal control can vary widely, ranging from $6,000 (ACS Lite) to $60,000 (SCOOT) per intersection.

Experience with adaptive signal control systems in the United States and other countries.

Made Public Date
06/30/2014

13

Nationwide
United States
Identifier
2014-00306
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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.
 

System Year (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 timing More 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 plans More 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-networks 4 locations in the USA.
RHODES
(Real Time Hierarchical Optimized Distributed Effective System)
1990 (USA) Mainly for diamond interchange locations 4 locations in the USA.
ACS Lite 1990 to 2006 (USA) Operates with predetermined coordinated timing plans; automatically adjust splits and offsets accordingly 3 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.

SYSTEM COSTS

The table below provides a summarize data collected from field studies.

 

 

Adaptive Signal Control System
Initial Capital Cost (Per Intersection)
SCOOT $30,000 to $60,000
SCATS $20,000 to $30,000
OPAC $20,000 to $50,000
RHODES $30,000 to $50,000
ACS Lite $6,000 to $10,000

 

 

System Cost

See Summary

System Cost Subsystem