RESEARCH PROBLEM STATEMENTS: HIGHWAY CAPACITY

Twenty nine statements are presented here, grouped in the following areas: freeways; rural highways; signalized intersections; unsignalized intersections; arterials; and pedestrians/bicycles. The following have been identified as the top ten research needs: capacity of ramp-freeway junctions; validation of procedures for calculating signalized intersection delay levels of service and capacity of weaving areas; shared/permissive lanes at singnalized intersections; adjustment factors for saturation flow rates at signalized intersections; capacity analysis methods for cross-street stop and yield controlled intersections; LOS criteria for signalized intersections at near-capacity conditions; evaluation of the relationship between levels of service computed for unsignalized intersections and traffic signal warrants; freewqy capacity trends; benefits of operational improvements along two-lane rural highways.

• Record URL:
  • https://onlinepubs.trb.org/Onlinepubs/trcircular/319/319.pdf
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00978515
• Supplemental Notes:
  • Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
• Corporate Authors:

  Transportation Research Board

  500 Fifth Street, NW
  Washington, DC  United States  20001
• Publication Date: 1987-6

Media Info

• Media Type: Digital/other
• Pagination: 41 p.
• Serial:
  • Transportation Research Circular
  • Issue Number: 319
  • Publisher: Transportation Research Board
  • ISSN: 0097-8515

Subject/Index Terms

• TRT Terms: Arterial highways; Bicycles; Freeways; Highway capacity; Intersections; Level of service; Pedestrians; Ramps; Research; Rural highways; Signalized intersections; Traffic delays; Traffic flow; Unsignalized intersections
• Uncontrolled Terms: Intersection capacity
• Subject Areas: Highways; Operations and Traffic Management; Pedestrians and Bicyclists; Research; I71: Traffic Theory;

Filing Info

• Accession Number: 00472277
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Aug 31 1987 12:00AM