In San Antonio, Texas, a freeway management system reduced fuel consumption by an estimated 2,600 gallons per major incident.

12-16 January 1997
San Antonio,Texas,United States

Summary Information

The first phase of the San Antonio TransGuide System became operational on July 26, 1995 and included 26 miles of downtown freeway. This paper documents the impact of the system on crashes and incident response times during the first five months of operation and reports the findings of a survey investigation into driver response to the TransGuide system.


Review of video surveillance data collected throughout 1995 indicated an average reduction in response time of 20 percent. This result compared responses to incidents recorded in the months prior to implementation to those recorded once the TransGuide system became operational. This reduction in response time was input into the CORFLO freeway simulation model. The results showed an average delay savings of 700 vehicle-hours, and a fuel consumption decrease of 2600 gallons per major incident. Using the accident frequency for freeways, these figures translated into an annual savings of $1.65 million.

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Before-and-After Analysis of the San Antonio TransGuide System

Author: Henk, Russel H., et al.

Published By: Paper presented at the 76th Annual Transportation Research Board Meeting. Washington, District of Columbia

Source Date: 12-16 January 1997


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Typical Deployment Locations

Metropolitan Areas


DMS, CMS, VMS, Changeable Message Signs, Variable Message Signs, CCTV, closed circuit television cameras, road monitoring, camera imaging

Benefit ID: 2007-00412