Incorporation of Travel Time Reliability into the Highway Capacity Manual

The objective of this project is to determine how data and information on the impacts of the differing causes of non-recurrent congestion on highway capacity can be incorporated into the performance measure and level of service estimation procedures contained in the Highway Capacity Manual (HCM). The HCM is the main tool of designers for determining the appropriate size of a facility to meet future demand levels, but its limited information on the impacts of weather and work zones on freeway capacity is from other countries. No information is provided for other facility types or for other causes of non-recurrent congestion. The methodologies contained in the HCM for predicting delay, speed, queuing, and other performance measures for alternative highway designs are not currently sensitive to incident management techniques and other operation/design measures for reducing non-recurrent congestion.


  • English


  • Status: Completed
  • Funding: $1500000.00
  • Contract Numbers:

    Project L08

  • Sponsor Organizations:

    Strategic Highway Research Program 2

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

    Hyman, William

  • Start Date: 20100927
  • Expected Completion Date: 0
  • Actual Completion Date: 20130831
  • Source Data: RiP Project 15542

Subject/Index Terms

Filing Info

  • Accession Number: 01462721
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project L08
  • Files: TRB, RiP
  • Created Date: Jan 3 2013 2:09PM