Benefit

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.


May 2000
San Antonio,Texas,United States


Summary Information

This report summarized the results of several ITS evaluation projects in the city of San Antonio, Texas. San Antonio had a relatively extensive implementation of ITS prior to this study and, consequently, the incremental benefits experienced in San Antonio through expansion and additions to the existing system may be somewhat smaller than the benefits that could be achieved in areas with little prior implementation of ITS.

The evaluation report detailed benefits information regarding the implementation of an incident management program with dynamic message signs (DMS) along a freeway corridor and traffic signal timing control operations along a parallel arterial. Through a modeling effort, the study investigated the impacts of each implementation individually, and also evaluated the combined impact of integrating the DMS with incident management and then integrating both the DMS and incident management with traffic signal timing plan alterations along an alternative arterial route.

Results indicate that the most effective stand-alone implementation is incident management, recording improvements in all impact measures assessed. DMS and arterial traffic signal control can provide additional improvement under many of these areas. For the particular corridor modeled during this study, optimum implementation of the integrated DMS and incident management results in a 5.7 percent decrease in delay. Integrated use of incident management, DMS and arterial traffic control can achieve an benefit of a 5.9 percent reduction in delay.

The evaluation reports contains several conclusions and recommendations drawn from the results above, and discussions with various stakeholders within the projects:
  • A successful ITS deployment requires a strong institutional framework.
  • The combined benefit of integrated ITS components may not equal the sum of individual implementations, however this integration can offer improved benefits and costs over isolated deployments. For example, the reduction in delay possible along a particular corridor during a major incident was 16.2 percent with and incident management system operating alone, 4.6 percent with only a freeway management system, 2.8 percent with only an arterial management system, and 19.9 percent with all three systems implemented in coordination. It is also important to integrate the three systems described above in a strategic fashion. Applying all three systems to every incident, regardless of severity, can decrease the overall benefit of the systems by encouraging travelers to unnecessarily change their travel plans during minor incidents.

    Notes

    See also:
    Advanced Warning for Railroad Delays in San Antonio, Lessons Learned from the Metropolitan Model Deployment Initiative,2000.

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Source

Metropolitan Model Deployment Initiative: San Antonio Evaluation Report - Final Draft

Author: Carter, M., et al.


Published By: Federal Highway Administration, U.S. DOT

Prepared by SAIC for the U.S. DOT

Source Date: May 2000

EDL Number: 12883

Other Reference Number: Report No. FHWA-OP-00-017

URL: http://ntl.bts.gov/lib/jpodocs/repts_te/12883.pdf

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Benefits From This Source

Evaluation indicated that integrating DMS and incident management systems could reduce crashes by 2.8 percent, and that integrating DMS and arterial traffic control systems could decrease crashes by 2 percent, in San Antonio, Texas.

Evaluation of freeway DMS integrated with incident management in San Antonio, Texas, found fuel consumption reduced by 1.2 percent; integrating the DMS with arterial traffic control systems could save 1.4 percent.

In San Antonio, Texas, 60 percent of drivers of transit vehicles equipped with in-vehicle navigation devices reported that they saved time and felt safer.

In San Antonio, Texas, focus group participants felt that DMS were a reliable source of traffic information.

In San Antonio, Texas, usage of a traveler information Web site increased at a rate of 19 percent per year and spiked during severe weather events.

Modeling performed as part of an evaluation of nine ITS implementation projects in San Antonio, Texas indicated that drivers of vehicles with in-vehicle navigation devices could experience an 8.1 percent reduction in delay.

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.

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.

Costs From This Source

An advanced highway-rail intersection warning system was deployed for just over $350,000 as part of the San Antonio Metropolitan Model Deployment Initiative.

In-vehicle navigation units and real-time traveler information software development were the main cost drivers for the San Antonio TransGuide MMDI project to improve operations at several public agencies.

Over half of the $3.25 million cost for the San Antonio Lifelink advanced telemedicine project was attributed to reseach and development.

The integrated freeway/incident management system covering 28.9 miles in San Antonio was deployed for approximately $26.6 million.

Benefit ID: 2000-00134