Analysis of Managed Lanes on Freeway Facilities

Managed lanes are becoming more prevalent on freeway facilities and their operational and geometric characteristics vary greatly. While there is no nationally recognized definition of managed lanes, for the purposes of this project, managed lanes are considered to include high-occupancy vehicle (HOV) lanes, high-occupancy/toll (HOT) lanes, and express toll lanes. The Highway Capacity Manual (HCM) includes methodologies for analyzing freeway facilities but it does not address managed lanes. Some of the reasons that HCM freeway methodologies may not apply to managed lanes are: (1) unique access patterns with general purpose lanes, (2) significant speed differentials between adjacent lanes, and (3) no opportunities for passing on single managed lanes. A better understanding of the operational characteristics of freeway facilities with managed lanes is needed. Transportation agencies need information on the performance of the managed and general purpose lanes to plan the facility and determine the pricing strategy to manage demand. Including performance assessment and operational analysis of managed lanes in the HCM would greatly enhance its usefulness to engineers, designers, planners, and decision makers.  The objectives of this project are to develop methods for the performance assessment and capacity analysis of managed lanes and to develop draft material for the post-2010 Highway Capacity Manual. Through NCHRP Project 3-92, the TRB Committee on Highway Capacity and Quality of Service is developing a new edition of the HCM, scheduled for publication in 2010. It is expected that the results of NCHRP Project 3-96 will be incorporated into a subsequent edition of the HCM.


  • English


  • Status: Active
  • Contract Numbers:

    Project 3-96

  • Sponsor Organizations:

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  USA  20590

    American Association of State Highway & Transportation Officials

    444 North Capitol Street, NW, Suite 225
    Washington, DC    20001

    National Cooperative Highway Research Program

    Transportation Research Board
    500 Fifth Street, NW
    Washington, DC  USA  20001
  • Project Managers:

    Derr, B

  • Performing Organizations:

    University of Washington, Seattle

    Washington State Transportation Center
    1107 NE 45th Street
    Seattle, WA  USA  98105
  • Principal Investigators:

    Wang, Yinhai

  • Start Date: 20090403
  • Actual Completion Date: 20110402
  • Source Data: RiP Project 17862

Subject/Index Terms

Filing Info

  • Accession Number: 01464492
  • Record Type: Research project
  • Source Agency: National Cooperative Highway Research Program
  • Contract Numbers: Project 3-96
  • Files: TRB, RiP, USDOT
  • Created Date: Jan 3 2013 2:43PM