MAJOR MOTORWAY INTERCHANGES: A REVIEW OF EXISTING SITES, THE NEW DOE RECOMMENDATIONS AND POSSIBLE FUTURE TRENDS

Noteworthy points arising from the review of sites are discussed, comments are made on the recommendations, and future trends related to single lane links and merging and diverging are reviewed. It is noted that stock solutions for major interchanges are not likely, and that some operational interchange problems are really network inconsistencies often of a temporary nature. Care is urged in designing to avoid creating bottlenecks. The opinion is expressed that there is little use in pursuing cost benefit analyses to the limit in optimizing designs at specific locations as land use, social and other factors often override it. However such analyses can be advantageous in the early stages of design. Comments are made on the DOE recommendations relating to the early stages of the design process, the optimisation process whereby the operational, economic and other aspects are tested, the decision between non free flow or free flow interchanges, and design speed. Comments are also made on speed values from 80 to 50 kph, the disadvantage to maintenance and emergency vehicles, interchanges on hilltop sites, the effect of spacings and signing on traffic movement, the effect of weaves, and mandatory speed limits.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/0266450X
• Supplemental Notes:
  • This article appeared in Road Design which is a publication containing the Proceedings of Seminar X held at the University of Warwick, England.
• Corporate Authors:

  Planning and Transport Res and Computation Co Ltd

  167 Oxford Street
  London W1R 1AH,   England 

  Planning and Transport Res and Computation Co Ltd

  167 Oxford Street
  London W1R 1AH,   England 
• Authors:
  • SIMPSON, D
• Publication Date: 1975-7

Media Info

• Features: Figures; Tables;
• Pagination: p. 173-191
• Serial:
  • Publication of: Planning and Transport Res and Computation Co Ltd
  • Publisher: Planning and Transport Res and Computation Co Ltd
  • ISSN: 0266450-X

Subject/Index Terms

• TRT Terms: Benefit cost analysis; Emergency vehicles; Highway design; Interchanges; Interchanges and intersections; Merging traffic; Optimization; Speed limits; Traffic control; Traffic flow
• Subject Areas: Highways; Operations and Traffic Management;

Filing Info

• Accession Number: 00145022
• Record Type: Publication
• Report/Paper Numbers: P131
• Files: TRIS
• Created Date: Feb 1 1977 12:00AM