Developing a Context-Sensitive Functional Classification System for More Flexibility in Geometric Design

Since 1984, the AASHTO “Green Book” (A Policy on the Geometric Design of Highways and Streets) and other roadway design criteria have been based on a functional classification system of a hierarchical roadway network composed of arterials, collector roads, and local roads. This classification is further broken out by an urban or rural designation. This system is described in Highway Functional Classification Concepts, Criteria and Procedures (FHWA-PL-13-026). This system of highway classification has been under increasing scrutiny and discussion due to some incompatibilities with context-sensitive design, practical design, and other innovative approaches. The objective of this research is to identify potential improvements to the traditional functional classification system to better incorporate the context, user needs, and functions of the roadway facility. The potential improvements should lead to a flexible framework that can be used by planners and designers in the development of optimal geometric design solutions.


  • English


  • Status: Completed
  • Funding: $300000
  • Contract Numbers:

    Project 15-52

  • 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 Kentucky, Lexington

    Lexington, KY  United States  40506-0281
  • Principal Investigators:

    Stamatiadis, Nick

  • Start Date: 20150115
  • Expected Completion Date: 20180131
  • Actual Completion Date: 20180131
  • Source Data: RiP Project 37704

Subject/Index Terms

Filing Info

  • Accession Number: 01543621
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 15-52
  • Files: TRB, RiP
  • Created Date: Nov 19 2014 1:03AM