REVISION OF NCHRP METHODOLOGY FOR ANALYSIS OF WEAVING-AREA CAPACITY

As part of an effort sponsored by the Federal Highway Administration (FHWA) to revise and update procedures for freeway capacity analysis, the weaving-area methodology developed as a result of National Cooperative Highway Research Program (NCHRP) Project 3-15 was revised with two objectives in mind: (a) to recalibrate the procedure to reflect modified service-volume concepts developed in other parts of the FHWA effort and (b) to simplify the structure of the NCHRP procedure to make it easier to apply and understand while retaining its demonstrated accuracy and sensitivity to lane configuration, a major factor in highway operations. The revised method was developed by using standard multiple regression techniques and a data base consisting of results of the 1963 U.S. Bureau of Public Roads study of weaving-area capacity and the results of extensive data collection on NCHRP Project 3-15. The procedure consists of calibrated relations governing (a) the operation of nonweaving vehicles in weaving areas, (b) the maximum number of lanes that can be occupied by weaving vehicles for various configurations; (c) the "share", or percentage, of weaving-area lanes occupied by weaving vehicles under "balanced" operation; and (d) the relation between the average speed of weaving vehicles and that of nonweaving vehicles. To simplify the application of these relations in design and operational analysis, a series of nomographs has been developed. (Author)

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• Supplemental Notes:
  • Publication of this paper sponsored by Committee on Highway Capacity and Quality of Service.
• Authors:
  • Roess, Roger P
  • McShane, William R
  • Pignataro, Louis J
• Conference:
  • 59th Annual Meeting of the Transportation Research Board
  • Location: Washington District of Columbia, United States
  • Date: 1980-1-21 to 1980-1-25
• Publication Date: 1980

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 58-65
• Monograph Title: Traffic flow theory, characteristics and capacity
• Serial:
  • Transportation Research Record
  • Issue Number: 772
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Calibration; Data collection; Freeways; Highway capacity; Motor vehicles; Nomographs; Shape; Speed; Traffic lanes; Traffic simulation; Traffic speed; Weaving sections
• Uncontrolled Terms: Configuration
• Old TRIS Terms: Freeway capacity
• Subject Areas: Highways; Operations and Traffic Management; I71: Traffic Theory;

Filing Info

• Accession Number: 00334164
• Record Type: Publication
• ISBN: 0309031168
• Files: TRIS, TRB
• Created Date: Oct 28 1981 12:00AM