COMPARISON OF 1985 AND 1994 HCM: SIGNALIZED INTERSECTION DELAY ESTIMATES

The revised "Highway Capacity Manual," released in late 1994 by the Transportation Research Board, included an updated version of the HCM analysis procedure for signalized intersections--Chapter 9. Research was initiated to determine the improvement (if any) in the delay estimation accuracy, comparing the operational procedure for signalized intersection capacity analysis of the 1985 HCM with the 1994 version. Data for the study were collected from busy intersections with fully actuated signal controls in Chicago, Illinois, and Honolulu, Hawaii. This article is structured in four parts, including: 1) a description of the methodology and data; 2) a summary of differences in procedure, formulas, and factors between the 1985 and 1994 version of HCM's Chapter 9; 3) a discussion of potential causes of errors in delay estimation; and 4) conclusions. Overall, investigators found that the 1994 update of Chapter 9 in the HCM improves the accuracy of delay and level of service estimation.

  • Availability:
  • Corporate Authors:

    Institute of Transportation Engineers (ITE)

    Washington, DC  United States 
  • Authors:
    • Prevedouros, P D
    • Koga, C A
  • Publication Date: 1996-7

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00726955
  • Record Type: Publication
  • Files: TRIS, ATRI
  • Created Date: Oct 17 1996 12:00AM