Development and Application of Access Management Guidelines

Many states and local governments are considering, or in the process of, revising their access management standards and guidelines. These standards or guidelines commonly include key elements such as: a) an access management classification system and access management categories; b) signalized access spacing; c) medians and median opening spacing and design; d) unsignalized access spacing; e) driveway design; f) internal and interparcel circulation; and g) alternative access.</font></div><div><font size="3">These standards and guidelines are often based on a continuation of historical practices or from the practices of other jurisdictions. As a result, the access management criteria often vary widely and questions remain as to the appropriate access spacing and design criteria for different types of roadways and roadside environments. </font><font size="3">However, at this time, there is no consolidated source giving a rationale for the application of various access management techniques and their designs. Research is needed to provide information for state DOTs and local governments to rationally evaluate their current access management standards or guidelines; document the safety and operational logic for adoption and administration of access management techniques; provide guidance for the adoption of criteria and procedures for deviation from access management standards while maintaining consistency in the permitting process; and to help address institutional, political, and economic barriers to the adoption of rationale access management standards. </font><font size="3">The research will examine and compare the roadway design manuals, access management standards and guidelines, driveway designs and other relevant manuals adopted by the various state departments of transportration (DOTs) as well as selected local governments. Agencies will be contacted to ascertain: a) why the agency adopted guidelines rather than standards; b) the rationale for the standards/guidelines for signal spacing, unsignalized access spacing, the use of medians, median opening spacing and design, driveway geometrics, warrants for and design of auxiliary lanes, etc.; c) criteria and procedures for deviations from adopted standards; d) how applications vary for different roadside environments (rural, suburban and urban) or roadway functional design types; and e) issues in administration of the standards/guidelines such as consistency in application of the standards/guidelines and institutional, political, and economic barriers to implementation. </font><font size="3">A major objective of the research will be to develop a rationale or basis (criteria) for such access management elements as, but not limited to, the following: a) roadway classification and access management categories; b) signal spacing; c) unsignalized access spacing for different access management categories; d) driveway design; e) warrants for auxiliary lanes; f) design of auxiliary lanes; g) median opening spacing and design; h) u-turns, including u-turns by large vehicles; i) access connections on opposite sides of undivided roadways; j) warrants for and design of isolated left-turn lanes and shoulder by-pass lanes; k) application of a continuous two-way, left-turn lane (TWLTL); and l) replacing a TWLTL with a nontraversable median. The research will also identify variations, where appropriate, in the desired application of the access management elements. </font><font size="3">This research would culminate in model access categories and model sets of access management and design guidelines and procedures for various roadway functional classifications and design types. It would also address how these criteria might vary in the context of different roadside environments. The resulting models would be accompanied by detailed rationale on their benefits and application so they may be readily adapted and applied by state transportation agencies and local governments or MPOs, through their transportation planning and design processes.</font></div><div><font size="3"> </font></div>


  • English


  • Status: Active
  • Contract Numbers:

    Project 3-99

  • Sponsor Organizations:

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  USA  20590

    American Association of State Highway & Transportation Officials

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

    National Cooperative Highway Research Program

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

    Hedges, Christopher

  • Performing Organizations:

    Oregon State University, Corvallis

    Department of Civil Engineering
    202 Apperson Hall
    Corvallis, OR  USA  97331-2302
  • Principal Investigators:

    Dixon, Karen

  • Start Date: 20090506
  • Actual Completion Date: 20110525
  • Source Data: RiP Project 17898

Subject/Index Terms

Filing Info

  • Accession Number: 01464489
  • Record Type: Research project
  • Source Agency: National Cooperative Highway Research Program
  • Contract Numbers: Project 3-99
  • Files: TRB, RiP, USDOT
  • Created Date: Jan 3 2013 2:43PM