Federal, State and local transportation policy has recently been redirected to emphasize increasing the efficiency of the transportation system rather than continue to increase capacity to handle travel growth. Unfortunately, base data is lacking to define the present person carrying capacity of the system. Also lacking are the field techniques and procedures to indicate when a data base is sufficient to indicate perceptible changes brought about by incentives. The research was directed to observing variations in peak hour auto occupancy on different days of the week, monthly, seasonally and along major corridors. The research also collected data on time of day variations, CBD cordons and special traffic generators and tested for error in field collection through redundant counts at various stations. The researchers explored and applied various statistical tests and included a discussion of the applicability and usefulness of different procedures for exploring different kinds of variations. There turned out to be no predictable pattern of variation of type of facility, varying traffic volumes, levels of transit service and distance from CBD center. There also was no significant predictable variation by day of week, month or season which was counter to the study hypothesis. Although no predictable variation was discovered within the limits of the study, the researchers were able to suggest the minimum auto occupancy measurement necessary to accurately evaluate a change in auto occupancy due to the provision of an exclusive lane, ramp, etc.

  • Corporate Authors:

    Seattle and King County, Washington

    Commuter Pool
    Seattle, WA  United States 

    Federal Highway Administration

    Traffic Systems Division, 1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Roach, W T
    • Lester, M
  • Publication Date: 1978-9

Media Info

  • Pagination: 42 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00197412
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: FHWA-RD-78-198 Final Rpt.
  • Contract Numbers: DOT-FH-11-9261
  • Files: NTIS, TRIS, USDOT
  • Created Date: Jul 31 1979 12:00AM