DEVELOPMENT OF MODIFIED PROCEDURES FOR ANALYSIS OF RAMP CAPACITY

As part of an overall effort sponsored by the Federal Highway Administration to update and revise freeway capacity analysis procedures, Highway Capacity Manual procedures for ramps and ramp junctions were revised in order to (a) eliminate the dual procedure for differing levels of service; (b) eliminate cases in which on ramps are followed by off ramps and both are joined by an auxiliary lane, cases that are better treated as weaving sections; (c) adjust criteria to reflect passenger cars per hour rather than a vehicle population with 5 percent trucks; (d) update information on trucks in lane 1 of the freeway; (e) add material on left-handed ramps, ramps on 10-lane freeway segments, and ramps proper; and (f) add illustrative material on the impact of ramp geometry and acceleration-lane design. It is believed that the modifications recommended significantly simplify the use of, and eliminate many potential inconsistencies, in existing Highway Capacity Manual procedures. (Author)

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 66-72
  • Monograph Title: Traffic flow theory, characteristics and capacity
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00334165
  • Record Type: Publication
  • ISBN: 0309031168
  • Files: TRIS, TRB
  • Created Date: Oct 28 1981 12:00AM