Traffic Flow Improvements: Quantifying the Influential Regions and Long-Term Benefits

The Congestion Mitigation and Air Quality (CMAQ) Improvement Program is a very important federal funding source that supports projects and programs for Massachusetts to improve air quality and reduce traffic congestion. It is anticipated that CMAQ will provide approximately $340 million to the Commonwealth for the 2018-2022 funding cycle. To leverage support from CMAQ for a project, a critical step is to obtain the review approval from the CMAQ Consultation Committee to assure that the project demonstrates significant air quality benefits. For projects in the category of traffic flow improvements, transportation agencies are often challenged by two important problems: (1) how to estimate the benefits to a secondary corridor due to the improvements of the primary corridor, and (2) how the gains of a project, including congestion relief (e.g., delay reduction) and reduction of air pollution (e.g., emission of NOx), will evolve over time. These problems are very important for the Massachusetts Department of Transportation (MassDOT) to understand the full-scale of gains from the traffic flow improvements and then to identify suitable projects and leverage resources from CMAQ for Massachusetts. The objective of this research is to conduct a synthesis study on the full-scale effects of traffic flow improvements in terms of the influential region and the changes of gains over time. The ultimate goal is to inform MassDOT’s Office of Transportation Planning’s evaluation of CMAQ projects and their demonstrated benefits to relieve congestion and improve air quality.


  • English


  • Status: Completed
  • Funding: $100000
  • Contract Numbers:


  • Sponsor Organizations:

    Federal Highway Administration

    Massachusetts Division
    55 Broadway, 10th Floor
    Cambridge, Massachusetts  United States  02142
  • Managing Organizations:

    Massachusetts Department of Transportation

    10 Park Plaza
    Boston, MA  United States  02116
  • Project Managers:

    Zavolas, Nicholas

  • Performing Organizations:

    University of Massachusetts Lowell

    One University Drive
    Lowell, MA  United States  01854
  • Principal Investigators:

    Yuanchang, Xie

    Chen, Danjue

  • Start Date: 20180501
  • Expected Completion Date: 20190331
  • Actual Completion Date: 0
  • USDOT Program: Research and Development

Subject/Index Terms

Filing Info

  • Accession Number: 01688705
  • Record Type: Research project
  • Source Agency: Massachusetts Department of Transportation
  • Contract Numbers: 103840
  • Files: RIP, STATEDOT
  • Created Date: Dec 17 2018 3:48PM