Development of Clear Recovery Area Guidelines

Objective: The objective of this study is to develop guidelines for roadside clear zones that can be incorporated into the AASHTO Roadside Design Guide. TASKS: PHASE I: (1) Update the encroachment relationships developed under NCHRP Project 17-11 using the crash database developed under NCHRP Project 17-22. (2) Review the encroachment rate data. (3) Update the Roadside Safety Analysis Program (RSAP) using the Project 17-22 data: (4) Develop a Benefit/Cost (B/C) Analysis Plan that defines the variables (e.g., sideslope, ditch, shoulder, curvature, etc.), includes an analysis matrix and defines hazard types and severities beyond the recovery area. (5) Determine the appropriate cost data for direct cost items (e.g., ROW acquisition, clearing, grading, maintenance (mowing), etc.). (6) Conduct a sensitivity analysis. (7) Submit an interim report that summarizes the findings from Tasks 1 through 6 including the B/C analysis plan. (8) Meet with the NCHRP panel to review the Task 7 interim report approximately 1 month after its submittal.  Submit a revised interim report addressing the panel’s review comments. PHASE II: (9) Execute the approved analysis plan. (10). Develop preliminary clear recovery area guidelines in a format suitable for incorporation into AASHTO Roadside Design Guide. (11) Meet with NCHRP panel and members of the AASHTO Subcommittee on Design to review the preliminary clear recovery area guidelines.  After the meeting, the contractor shall revise the guidelines in response to the review comments and decisions at the meeting. (12) Submit a final report documenting the entire research effort. The final report shall describe how the project was conducted and include as an appendix the guidelines for the RDG.


  • English


  • Status: Active
  • Funding: $270000
  • Contract Numbers:

    Project 17-11(02)

  • Sponsor Organizations:

    Federal Highway Administration

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

    American Association of State Highway & Transportation Officials (AASHTO)

    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:

    Jared, David

  • Performing Organizations:

    Texas A&M Research Foundation, College Station

    Texas A&M University
    College Station, TX  United States  77843
  • Principal Investigators:

    Bligh, Roger

  • Start Date: 20080907
  • Expected Completion Date: 20210131
  • Actual Completion Date: 0
  • Source Data: RiP Project 37956

Subject/Index Terms

Filing Info

  • Accession Number: 01545891
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 17-11(02)
  • Files: TRB, RiP
  • Created Date: Nov 27 2014 1:00AM