Research for the AASHTO Standing Committee on Planning. Task 38. Supplemental Evaluation in Support of NCHRP 25-17

The purpose of this task is to re-evaluate the conclusions of the Final Report developed under National Cooperative Highway Research Program (NCHRP) Project 25-17 based on new emission factor models, new rules, and impending implementation guidance that were not available during the original research effort. The emissions and air quality modeling results will be re-evaluated based on the new MOBILE6 and EMission FACtor (EMFAC) models that were not available in time to be incorporated into the Project 25-17 efforts. The effects of new rules, such as the Heavy Duty/Low Sulfur Diesel Rule, that were not in place when the previous analysis was performed will also be included. In may also be important to factor in our current understanding of emerging rules (e.g., Clear Skies Initiative, Non-Road Engine Rules, etc.). The implications of the new models and new rules on SIP development and future conformity determinations will be determined. Ultimately, the conclusions of Project 25-17 will be confirmed or revised accordingly.


  • English


  • Status: Completed
  • Contract Numbers:

    Project 08-36, Task

  • Sponsor Organizations:

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590

    American Association of State Highway & Transportation Officials

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

    National Cooperative Highway Research Program

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

    McCready, Ronald

  • Performing Organizations:

    Environ International Corporation

    101 Rowland Way
    Novato, CA  United States  94945
  • Principal Investigators:

    Souten, David

  • Start Date: 20030822
  • Expected Completion Date: 0
  • Actual Completion Date: 20050130
  • Source Data: RiP Project 8540

Subject/Index Terms

Filing Info

  • Accession Number: 01557261
  • Record Type: Research project
  • Source Agency: National Cooperative Highway Research Program
  • Contract Numbers: Project 08-36, Task
  • Files: RiP
  • Created Date: Mar 19 2015 1:02AM