DOWNGRADE SPEED CHARACTERISTICS OF HEAVY VEHICLES

The speed characteristics of heavy vehicles on downgrades are analysed. The analyses were made by field observations of truck speeds on six rural two-lane downgrades. Loaded trucks considerably reduced their speeds at the beginning of a downgrade. The amount of reduction, termed the approach-speed gradient, was related to the length and slope of the downgrade, the second variable contributing exponentially to the increase in gradient. Buses and empty trucks increased their speeds at the downgrades studied. Using a previously developed model, which is based on delay measures and the speed distribution of trucks and passenger cars, passenger-car equivalents for downgrades are calculated and evaluated.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/8674831
• Corporate Authors:

  American Society of Civil Engineers

  345 East 47th Street
  New York, NY  United States  10017-2398
• Authors:
  • Polus, A
  • Craus, J
  • Grinberg, I
• Publication Date: 1981-3

Media Info

• Features: References;
• Pagination: p. 143-152
• Serial:
  • Journal of Transportation Engineering
  • Volume: 107
  • Issue Number: 2
  • Publisher: American Society of Civil Engineers
  • ISSN: 0733-947X
  • Serial URL: https://ascelibrary.org/journal/jtepbs

Subject/Index Terms

• TRT Terms: Buses; Downgrades (Roads); Highway grades; Highway transportation; Length; Loads; Mathematical models; Motor vehicles; Rural highways; Slopes; Speed; Traffic control; Traffic speed; Traffic surveys; Trucks; Vehicles
• Old TRIS Terms: Downgrade
• Subject Areas: Highways; Motor Carriers; Operations and Traffic Management; Public Transportation; Vehicles and Equipment; I71: Traffic Theory;

Filing Info

• Accession Number: 00334564
• Record Type: Publication
• Source Agency: Engineering Index
• Files: TRIS
• Created Date: Aug 15 1981 12:00AM