Pilot Testing and Validation of Part-Time Shoulder Use Methods

Part-time shoulder use (PTSU) on roadways is an increasingly popular and practical performance-based design strategy for reducing congestion and improving travel time and reliability for cars and buses. Even though PTSU has been in practice for many years, safety performance methods were not widely available until NCHRP Project 17-89, “Safety Performance of Part-Time Shoulder Use on Freeways.” NCHRP Project 17-89 produced methods that predict (1) the frequency of fatal-and-injury (FI) crashes and (2) the frequency of property damage only (PDO) crashes. These methods were applied to assess the overall effect of PTSU on total and severe crash frequency for basic freeway segments, entrance speed-change lanes, and exit speed-change lanes. Research is needed to support state departments of transportation (DOTs) in the implementation and testing of the methods developed under NCHRP Project 17-89. This will produce a better understanding of the safety performance of existing PTSU operations and the specific operational and design elements that influence their safety performance. The objective of this research is to support DOTs in pilot testing and further validation testing of the PTSU methods developed under NCHRP Project 17-89. Support to DOTs for pilot projects, at a minimum, includes identification of key DOT personnel for coordination, communication with key DOT personnel, aiding in the pilot project set-up, and providing technical direction in the activities and analyses related to the implementation of the pilot project to accomplish the research objective. Note: The scope shall not include bus on shoulder methods.


  • English


  • Status: Proposed
  • Funding: $125000
  • Contract Numbers:


  • Sponsor Organizations:

    National Cooperative Highway Research Program

    Transportation Research Board
    500 Fifth Street, NW
    Washington, DC  United States  20001

    American Association of State Highway and Transportation Officials (AASHTO)

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

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Project Managers:

    Barcena, Roberto

  • Start Date: 20230213
  • Expected Completion Date: 0
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01873037
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: 17-89B
  • Files: TRB, RIP
  • Created Date: Feb 13 2023 3:34PM