Development of a Comprehensive Access Management Policy and Guidelines - Phase 3: Data Analysis/Risk Assessment

This proposal outlines the activities proposed as a part of Phase III of the project titled, "Development of a Comprehensive Access Management Policy and Guidelines". Phase I included a review of the existing research literature, as well as an assessment of available data. Phase II has involved a quantitative risk assessment aimed at quantifying crash risk as a function of access point spacing while controlling for the effects of other important factors (e.g., AADT, segment length, number of through and auxiliary lanes, etc.). The results of these analyses provide an important Iowa-specific supplement to existing access management safety research. This will allow for the determination of thresholds for various access management policies. This will address issues such as the minimum spacing between freeway off-ramps and the first side-street driveway (full movement, three-quarter movement, right-in/right-out, etc.), the minimum spacing between on ramps and the first at-grade intersection on expressway facilities, and other access management characteristics of interest to the Iowa DOT. The objective of Phase III will be to establish a new and more functional access program framework within the DOT that incorporates modem access management strategies and is supportive of DOT goals to support the economic vitality of the State, preserve the functional integrity of the public's capital investment in the highway system and help ensure that the traveling public are provided with safe roads.


  • English


  • Status: Completed
  • Funding: $675,000
  • Contract Numbers:

    ISU Proposal 134340

    Add 531

  • Sponsor Organizations:

    Iowa Department of Transportation

    800 Lincoln Way
    Ames, IA  United States  50010
  • Managing Organizations:

    Iowa Department of Transportation

    800 Lincoln Way
    Ames, IA  United States  50010
  • Project Managers:

    Wright, Eric

  • Performing Organizations:

    Iowa State University, Ames

    Institute for Transportation
    2711 South Loop Drive, Suite 4700
    Ames, Iowa  United States  50010-8664
  • Principal Investigators:

    Savolainen, Peter

    Hawkins, Neal

  • Start Date: 20160116
  • Expected Completion Date: 20181231
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01590294
  • Record Type: Research project
  • Source Agency: Iowa Department of Transportation
  • Contract Numbers: ISU Proposal 134340, Add 531
  • Files: RIP, STATEDOT
  • Created Date: Feb 16 2016 3:21PM