The purpose of this research was to develop a methodology for determining commercial driveway spacing guidelines on arterial roads through an optimization of both safety (accident rate) and level of service (density). This project was developed due to the recognition that access control is one of the most important design elements that affect roadway safety and capacity on arterial roads. Both safety and level of service could be improved through the implementation of proper access management strategies. A literature search revealed that there are differences in the development of unsignalized driveway spacing standards among the states that already use access management plans, including methodologies such as safe stopping distance and right turn overlap analysis. Therefore, the goal was to develop a consistent and reliable methodology for developing commercial driveway spacing standards. Data for the study were obtained at selected urban and suburban sites within Virginia. A regression analysis was performed to develop models that independently correlated the driveway spacing with the density and accident rate. Once these two models were derived, they were used to develop guidelines for the driveway spacing on roads with varying access classification. Driveway spacing guidelines were found for both measures of effectiveness; then the greater of the two values was used as a guideline for the driveway spacing on the study section.

  • Supplemental Notes:
    • Sponsored by U.S. Department of Transportation and the Virginia Department of Transportation. Pagination does not include the 12 Appendices.
  • Corporate Authors:

    University of Virginia, Charlottesville

    Center for Transportation Studies, P.O. Box 400742
    Charlottesville, VA  United States  22904-4742
  • Authors:
    • Garber, N J
    • White, T E
  • Publication Date: 1995-5


  • English

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 82 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00722134
  • Record Type: Publication
  • Report/Paper Numbers: UVA/529978/CE95/102
  • Contract Numbers: USDTTPSU0003-828
  • Files: TRIS
  • Created Date: Jun 14 1996 12:00AM