On-ramp Metering Experiments to Increase Freeway Merge Capacity

In this report, the authors present observations of two freeway/on-ramp merges that indicate the mechanism that causes their capacities to diminish when queues form just upstream. Using data from field experiments at one of the sites, the authors demonstrate that by responding to occupancies measured near the merge, ramp meter can effectively reverse this mechanism, or at least postpone its occurrence, thus generating higher merge capacities. Observations from the second site indicate that higher merge capacities can also be achieved using traffic control schemes that regulate inflows to the merge from the freeway shoulder lane.

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    California Department of Transportation

    1120 N Street
    Sacramento, CA  United States  95814

    University of California, Berkeley

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

    University of California, Berkeley

    Berkeley, CA  United States  94720-1720
  • Authors:
    • Cassidy, Michael J
    • Rudjanakanoknad, Jittichai
  • Publication Date: 2005-9


  • English

Media Info

  • Media Type: Digital/other
  • Pagination: 16 p.
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 01007030
  • Record Type: Publication
  • Source Agency: UC Berkeley Transportation Library
  • Report/Paper Numbers: UCB-ITS-PRR-2005-28
  • Created Date: Nov 8 2005 8:41AM