The Illinois DOT enhanced work zone safety on I-55 by deploying an automated traffic control system that posted traffic information and enforcement updates (number of citations issued) on dynamic message signs located upstream of the work zone.
Made Public Date
01/19/2007

519

Interstate 55
Springfield
Illinois
United States
Identifier
2007-00406
TwitterLinkedInFacebook

Intelligent Transportation Systems in Work Zones: A Case Study - Real Time Work Zone Traffic Control System

Summary Information

The Illinois DOT used ITS during reconstruction of a 40-mile section of Interstate 55 including the Lake Springfield Bridge. Reconstruction of the bridge involved closing the southbound span and diverting southbound traffic onto the northbound span, and then reversing the process once work on the southbound span was complete. To minimize congestion and improve safety in the work zone, the DOT deployed a Real Time Traffic Control System (RTTCS) from February 2001 to May 2002. The RTTCS consisted of 17 portable dynamic message signs (DMSs), 8 portable vehicle detectors, and 4 portable closed circuit television (CCTV) cameras linked to a central computer via a wireless communication system. The field components were solar powered.

The DMSs displayed a variety of messages including delay information, lane closure advisories, and the number of citations for moving violations. The CCTV camera images were used to confirm traffic and incident data. The central computer monitored traffic flow data from the vehicle detectors, calculated delay at each detector location, automatically displayed preprogrammed messages on DMSs, updated a real-time traffic condition map on the project website, and provided congestion and incident alerts for Illinois DOT staff via email or pager.

Although no official evaluation of the RTTCS was performed, DOT officials were satisfied with the performance of the system. There were only two crashes in the work zone due the lack of traffic backups and ample motorist warnings provided via DMSs. Safety was also enhanced by advisory messages on the number of citations that had been issued in the work zone. DOT staff reported a significant decrease in the number of moving violations after the system began displaying these messages.

Intelligent Transportation Systems in Work Zones: A Case Study - Real Time Work Zone Traffic Control System

Intelligent Transportation Systems in Work Zones: A Case Study - Real Time Work Zone Traffic Control System
Publication Sort Date
10/01/2004
Author
Scriba, Tracy, and David Register
Publisher
Federal Highway Administration, U.S. DOT
Other Reference Number
Report No. FHWA-HOP-04-018

(Our website has many links to other organizations. While we offer these electronic linkages for your convenience in accessing transportation-related information, please be aware that when you exit our website, the privacy and accessibility policies stated on our website may not be the same as that on other websites.)

Goal Areas
Deployment Locations