Phase II - Using Capacity Adjustments for Connected and Autonomous Based on Various Market Penetration Rates for Long Range Planning and Scenario Analysis

The capability of Connected and Autonomous Vehicles (CAV) is progressing at a faster rate with particular focus on technological performance, and its wide-ranging potential impacts on safety, operation, and regulatory issues. For example, CAVs could travel closer together at smaller headway which enables higher capacity through existing infrastructure. Existing CAV research is often limited in terms of scope, scale, approach, or underlying assumptions, and has not sufficiently addressed questions about the large-scale impacts of CAV on highway capacity, which are required by decision-makers to inform policies. Moreover, the Highway Capacity Manual (HCM) is at risk of becoming outdated or limited in relevance/usefulness as the CAV technologies become more prevalent on the market. The current HCM has multiple limitations regarding CAV analysis including: (1) Capacity-related HCM methods cannot be used to evaluate projects or facilities that would utilize CAV technology, as the impacts of CAV strategies are not accounted for. (2) Lack of existing analysis guidance regarding the suitability of the HCM for analyses involving CAV strategies. (3) Limited consideration of market penetration and the effects they will have on the realized outcomes associated with CAV technologies on various facilities. These limitations drive a critical need to develop HCM capacity adjustments (CCAV) to be prepared for future CAV operations under varying levels of volume and market penetration. Phase II Objectives: The HCM CAV pooled fund study is on track to meet all original study goals within the year 1 and 2 scope, and has successfully developed CAV adjustment factors for the HCM. This extension scope builds on the existing work with a primary focus on technology transfer, dissemination of results, and training. The specific tasks proposed for the Year 3 extension are as follows: Task A: Scenario Development, Task B: Training Materials, and Task C: Outreach and Webinars.


  • English


  • Status: Active
  • Funding: $453930
  • Contract Numbers:


  • Sponsor Organizations:

    Connecticut Department of Transportation

    2800 Berlin Turnpike
    Newington, CT  United States  06131

    Texas Department of Transportation

    125 E. 11th Street
    Austin, TX  United States  78701-2483

    Maryland Department of Transportation State Highway Administration

    707 N. Calvert Street
    Baltimore, MD  United States  21202

    North Carolina Department of Transportation

    P.O. Box 25201
    1 South Wilmington Street
    Raleigh, NC  United States  27611

    Oregon Department of Transportation

    355 Capitol St. NE
    Salem, OR  United States  97301-3871

    Washington State Department of Transportation

    Transportation Building
    Olympia, WA  United States  98504

    Arkansas Department of Transportation

    Little Rock, AR  United States 

    Indiana Department of Transportation

    Indiana Government Center North
    100 North Senate Avenue
    Indianapolis, IN  United States  46204-2249

    Utah Department of Transportation

    4501 South 2700 West
    Project Development
    Salt Lake City, UT  United States  84114-8380

    Florida Department of Transportation

    Research Center
    605 Suwannee Street MS-30
    Tallahassee, FL  United States  32399-0450
  • Project Managers:

    Knudson, Tony

  • Start Date: 20180816
  • Expected Completion Date: 20220707
  • Actual Completion Date: 0
  • Source Data: RiP Project 42347

Subject/Index Terms

Filing Info

  • Accession Number: 01641395
  • Record Type: Research project
  • Source Agency: Federal Highway Administration
  • Contract Numbers: TPF-5(371)
  • Created Date: Jul 23 2017 2:54PM