Preparations for Field Testing of Combined Variable Speed Advisory and Coordinated Ramp Metering for Freeway Traffic Control

Extensive site selection has been conducted for future testing of the Coordinated Ramp Metering (CRM) algorithm developed in a previous project. Two major corridors have been analyzed: I-880 in the San Francisco Bay Area and SR99 in Sacramento. Main factors for site selection include: road geometry, traffic volume, bottleneck locations and traffic situations, traffic data quality, and availability of ramp meter facility. Preliminary simulation results show that, on average, total travel time of the overall system could be reduced by 3-5%, total delay on the mainline could be reduced by 10-17%, total travel distance could be increased by 1% and total number of stops could be reduced by 15-24%, depending on traffic volume. Microscopic simulation results will be adjusted and field testing conducted at the selected site(s) in the next project phase.

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    University of California, Berkeley

    California PATH Program, Institute of Transportation Studies
    Richmond Field Station, 1357 South 46th Street
    Richmond, CA  United States  94804-4648

    California Department of Transportation

    Division of Research and Innovation
    1227 O Street, MS-83
    Sacramento, CA  United States  94273-0001
  • Authors:
    • Lu, Xiao-Yun
    • Chen, Danjue
    • Shladover, Steven E
  • Publication Date: 2014-1-15


  • English

Media Info

  • Media Type: Digital/other
  • Edition: Final Report
  • Features: Appendices; Figures; References; Tables;
  • Pagination: 278p
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 01530288
  • Record Type: Publication
  • Source Agency: UC Berkeley Transportation Library
  • Report/Paper Numbers: UCB-ITS-PRR-2014-1, CA14-2292
  • Contract Numbers: 65A0399
  • Created Date: Jul 11 2014 9:27AM