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Variable speed limit systems reduced the number and severity of crashes at three pilot sites in Texas. Benefit-to-Cost ratios ranged from 7:1 to 14:1.

FINDINGSThe table below excerpted from the source report shows the potential B/C ratios. The benefits predicted in these deployments were based on a seven percent reduction in crashes estimated from…
09/15/2017
Taxonomy: Variable Speed Limits

Variable speed limit pilot found to be effective reducing the number of overall crashes.

BenefitsDuring the variable speed limit pilot in Texas, two safety benefits were observed.
  • Total number of crashes overall was reduced.
  • At two of the three sites there was a…
06/26/2016
Taxonomy: Variable Speed Limits

Transit Signal Priority in San Antonio’s metropolitan transit system decreases travel time by up to 20 percent.

Most notably, the Primo BRT system features a transit signal priority (TSP) solution that uses "virtual" GPS-based detection zones- the first of its kind in the U.S. The virtual detection…
12/08/2015
Taxonomy: Transit Signal Priority

Field Evaluation of Detection Control System leaves 72 percent fewer vehicles in the dilemma zone

MethodologyA before and after study of crash data was used to evaluate the safety of the D-CS algorithm. The results were based on data for a 5-year "before" period and a 2-year "after…
12/07/2015
Taxonomy: Advanced Signal Systems

San Antonio pilot program results in up to 30 percent reduction of wrong way (WW) driving incidents.

MethodologyThe San Antonio Police Department (SA Police) began recording all WW driver reports in 2011. The SA Police, along with the Texas Department of Transportation (TxDOT), the Federal Highway…
11/30/2014
Taxonomy: Collision Avoidance

Arterial information allows travelers to make more informed decisions.

Advanced Traveler Information Systems that provide both static and dynamic information on arterial roadway conditions offer benefits in customer satisfaction and improved efficiency. In surveys…
01/19/2007
Taxonomy: Adaptive Signal Control

In San Antonio, a modeling study found that if traffic congestion were to increase by 25 percent, posting nearby railroad crossing closing delays on freeway dynamic message signs would reduce total network delay by up to 6.7 percent.

RESULTS With a 25 percent increase in congestion and a 15 percent driver compliance rate, the simulation model indicated the warning system would yield positive benefits in terms of reducing total…
09/19/2001
Taxonomy: Highway-Rail Crossing Warning

Modeling performed as part of an evaluation of nine ITS implementation projects in San Antonio, Texas indicated that integrating DMS, incident management, and arterial traffic control systems could reduce delay by 5.9 percent.

The evaluation report detailed benefits information regarding the implementation of an incident management program with traveler information and dynamic message signs (DMS) along a freeway corridor…
09/21/2000
Taxonomy: Advanced Signal Systems, Dynamic Message Signs, Dynamic Message Signs, Mobilization & Response, Surveillance & Detection

Modeling performed as part of an evaluation of nine ITS implementation projects in San Antonio, Texas indicated that users of an improved traveler information web site would receive annual benefits of a 5.4 percent reduction in delay.

Improvements to elements of San Antonio’s traveler information system included improvements to an Internet Web site. The Web site provided freeway traffic information including incident locations,…
09/21/2000
Taxonomy: Internet / Wireless