National Evaluation of the SafeTrip-21 Initiative: Final Report Real Time Intersection Delay

Through the U.S. Department of Transportation’s (USDOT) SafeTrip-21 initiative, the USDOT is testing a variety of technologies in a number of locations in California as well as along the I-95 corridor on the east coast. As part of this Federal initiative, the California Department of Transportation (Caltrans) tested the use of a traffic volume and signal timing information monitoring system. For the purposes of SafeTrip-21, this system is referred to as the real time intersection delay (RTID) system. During this testing, the USDOT conducted an evaluation to gain an understanding of the technical and institutional issues associated with using this system. The purpose of the evaluation is both to learn how such a system can enable signal phase and timing information, together with lane by lane traffic count data, to be collected in real time and processed from remote locations via the internet, and to determine how that information can be used effectively by State Department of Transportation (DOT) staff to optimize the performance of signalized intersections. The objective of the evaluation was to gather lessons learned from the test deployment of the RTID system in the San Francisco Bay Area. These lessons would serve Caltrans and other similar jurisdictions by providing guidance on successfully implementing RTID systems. In particular, USDOT and Caltrans were interested in learning about the factors that influence which locations are best suited for such systems and, if widely deployed, the changes in existing management policies that may be required for such systems to enhance traffic operations within existing resources. The SafeTrip-21 solicitation sought test sites and test applications. While Caltrans and its partners are providing the Bay Area test bed and using it to test a number of applications of their own, they also agreed to host field tests proposed by others. The field test for the RTID system is a case in point, for which the test was proposed by the vendor of the system, TrafInfo Communications Inc., and tested on the Caltrans test bed in the Bay Area. This document presents the evaluation findings, resulting primarily from in-person interviews the Evaluation Team conducted with institutional partners.

  • Record URL:
  • Corporate Authors:

    Science Applications International Corporation

    8301 Greensboro Drive
    McLean, VA  United States  22102

    Delcan Corporation

    8618 Westwood Center Drive
    Vienna, VA  United States  22182

    Department of Transportation

    Intelligent Transportation Systems Joint Program Office
    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Jasper, Keith
    • Miller, Sheryl
    • Armstrong, Christopher
  • Publication Date: 2010-9-17


  • English

Media Info

  • Media Type: Web
  • Edition: Final Report
  • Features: Figures; Maps; Photos;
  • Pagination: 26p

Subject/Index Terms

Filing Info

  • Accession Number: 01342833
  • Record Type: Publication
  • Report/Paper Numbers: FHWA-JPO-11-006
  • Contract Numbers: DTFH61-06-D-00005, Task No. T-09-008
  • Files: NTL, TRIS, USDOT
  • Created Date: Jun 15 2011 10:32AM