Highway Capacity Manual Methodologies for Corridors Involving Freeways and Surface Streets

The objective of this research is to develop material for the Highway Capacity Manual (HCM) that allows the analysis of corridors that include freeways and surface streets (e.g., Exhibit 2-1 of the HCM, 6th Edition). The research should emphasize the use of field data (existing and new) for the development and validation of methodologies. The HCM material should be based on the 6th edition of the HCM and include: (1) Performance and service measures for trips within corridors that use both the freeway and surface street facilities (urban streets for urban areas; multilane highways and two-lane highways for rural areas). All affected modes should be considered. (2) An analysis framework, primarily for planning and design purposes, that can be used to estimate the performance measures for alternative designs (including active traffic and demand management and other operational strategies) based largely on 6th edition HCM methodologies. (3) Adjustment factors and recommended modifications for HCM methodologies based on interactions between the freeway and surface street methodologies (e.g., queue spillback from ramp meters and ramp terminals, effects of platooned on-ramp vehicles). (4) Guidance on scoping the analysis, including spatial and temporal boundaries for the analysis corridor. (5) Limitations of the framework and methodologies. Conditions under which other analytical approaches would be more practical should be described. The capability of the framework and methodologies to accommodate demand shifts should be discussed. (6) Data requirements for the use of the framework and methodologies, including techniques for collecting the data. (7) Information on how traffic simulation, dynamic traffic assignment, and other alternative analysis approaches can complement the HCM material including comparing, integrating, and interpreting the analysis results. (8) Guidance on incorporating probe vehicle, crowd-sourced data, and other emerging data sources into the generation of performance measures and validation of analysis results. (9) Example problems illustrating use of the framework and methodologies. Tasks include: (Phase I): Task 1. Critically review the existing HCM methods and identify weaknesses related to trips using freeways and surface streets. Task 2. Critically review prospective performance measures including how they could be used and the data required to generate them. Propose a feasible framework for an HCM systems analysis based on feedback from the NCHRP 15-57 panel and the TRB Highway Capacity and Quality of Service (HCQS) Committee. Task 3. Develop a preliminary analytical framework for HCM systems evaluation based on the results of Tasks 1 and 2. Task 4. Develop a data collection plan for developing recommended improvements to the HCM and validating existing and new methodologies. Task 5. Prepare an interim report documenting the entire effort during Phase I of the project. Meet with the project oversight panel to discuss the interim report. (Phase II) Task 6. Collect and assemble all data and develop and calibrate the draft methods prescribed in the Interim Report. Task 7. The objectives of this task are to (a) evaluate the analysis methods developed under a variety of scenarios, (b) identify limitations of the methods, (c) evaluate the computational engine (Task 8), and (d) develop example problems and case studies. Task 8. Develop a computational engine and accompanying documentation for the new methods developed and recommend adjustments to existing computational engines. Task 9. Ensure that the methodology is adequately replicating conditions that are found in the field in terms of key performance measures. Task 10. Develop a draft final report documenting the entire research effort and the recommended HCM procedures. The report will detail recommended modifications to existing HCM procedures and document the computational engine. Task 11. Modify the draft final report based on comments received from the project oversight panel and the TRB HCQS Committee. The final deliverables will include (1) a final report that documents the entire research effort and includes draft modifications to the HCM as an appendix; (2) a computational engine and accompanying documentation for any new methodology and recommended adjustments to existing computational engines (the computational engine should conform to "Working Paper #6: Recommendations on Computational Engines"); and (3) a stand-alone technical memorandum titled "Implementation of Research Findings and Products".


  • English


  • Status: Active
  • Funding: $800000
  • Contract Numbers:

    Project 15-57

  • 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:

    Derr, B

  • Performing Organizations:

    University of Florida Transportation Institute

    2100 NE Waldo Rd.
    Gainesville, FL  United States  32609
  • Principal Investigators:

    Elefteriadou, Lily

  • Start Date: 20160818
  • Expected Completion Date: 20190217
  • Actual Completion Date: 0
  • Source Data: RiP Project 37562

Subject/Index Terms

Filing Info

  • Accession Number: 01543563
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 15-57
  • Files: TRB, RiP
  • Created Date: Nov 18 2014 1:03AM