CONSISTENCY OF MAXIMUM FLOW CHARACTERISTICS AND CONGESTION PATTERNS ON AN URBAN FREEWAY DURING MORNING PEAK PERIODS

Based on criteria for selecting maximum flow characteristics, data for 420 cells were collected on the Santa Monica Freeway for the period 1972 to 1975. Each cell includes three observed values: maximum flow rate, corresponding percentage of occupancy, and corresponding time. For the analysis of morning congestion patterns, 6d of data (5:00 to 11:00 a.m.) were collected. These data were selected for a ramdomized-block design with three independent variables: years, workdays, and locations. Analysis-of-variance and multiple-pairwise-contrast procedures showed that the most crucial independent variable causing inconsistency is locations, the next most crucial is years, and the least important is workdays. Among the various results, the maximum flow characteristics were found to be affected by the change in the overall conditions during 1975 (particularly, a different daylight savings time and perhaps the reduced speed limit and other energy crisis factors). The morning congestion patterns and the time-sequence pattern of the flow-concentration trajectories were found to be relatively undisturbed during the 3-year period. The results may be useful when applied to problems of desirable flow and occupancy (concentration) under high demand level, estimated freeway capacities, sensitivity of an estimated capacity (capacity buffer), and traffic bahavior during the peak period. /Author/

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 8-14
  • Monograph Title: Highway capacity, traffic flow, and traffic control devices
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00183534
  • Record Type: Publication
  • ISBN: 0309026733
  • Files: TRIS, TRB
  • Created Date: Dec 3 1978 12:00AM