This report investigates the issues and risks associated with the roadway infrastructure deployability of Automated Highway Systems (AHSs) in the context of case studies of both urban and rural area freeway corridors in California. The urban case study corridor, a portion of U.S. Route 101 in Los Angeles, represents the "worst" case corridor in that it poses the most overall constraints to AHS infrastructure deployment. The rural area case study corridors were portions of Interstate 5 in northern and southern California and portions of State Route 99 between Fresno and Sacramento. AHS deployment concepts consisting of at-, above-, and below-grade configurations, were evaluated given the physical roadway characteristics of the case study corridors. Based on an examination of these concepts relative to criteria such as acquisition of right-of-way, cost, and environmental impacts, the deployment potential of each concept was determined. The issues identified pertained to operational features of the at-grade configuration, design considerations for the above- and below-grade configurations, and environmental concerns relating to adjacent land use developments. Operational features include the effects of weaving activities on the capacity of manual lanes where lane changes occur to access the automated lane through a transition lane, requirements of physical barriers and design solutions for separating automated, transition, and manual lanes, vehicle segregation within shared automated/manual facilities, and psychological impact of barriers on drivers. Design requirements include structural engineering of elevated structures, locations of exclusive entry and exit facilities, and accommodation of manual lane splits and merges for automated facilities. Environmental concerns include the design comparability with adjacent development, land use considerations, and traffic impacts on neighborhood arterials. While the issues identified are directly related to the deployment concepts examined for the case studies, they nevertheless, provide valuable information applicable in other corridors.

  • Supplemental Notes:
    • California PATH Program.
  • Corporate Authors:

    University of California, Berkeley

    Institute of Transportation Studies, Richmond Field Station, 1301 South 46th Street
    Richmond, CA  United States  94804

    Federal Highway Administration

    Turner-Fairbank Highway Research Center, 6300 Georgetown Pike
    McLean, VA  United States  22101
  • Authors:
    • Miller, M
    • YIM, Y B
    • Hellman, P
    • Sharafsaleh, M
    • Hanson, M
  • Publication Date: 1995-4


  • English

Media Info

  • Pagination: 103 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00722528
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: Resource Materials, FHWA-RD-95-031, Final Report
  • Contract Numbers: DTFH61-93-C-00199
  • Files: TRIS, USDOT
  • Created Date: Jun 13 1996 12:00AM