SPEED OF VEHICLES ON GRADES

Prior to the initiation of this study there had not been a field study of actual truck and recreational vehicle performance, specifically their operating characteristics on critical highway grades, for several decades. The many changes in truck engine displacement and truck horsepower and the noticeable increase in the number of recreational vehicles indicated a need to reassess current climbing lane design practices. This research study presents current data characterizing trucks (and combinations) and recreational vehicles on grades. Field data collected at several locations in central and east Texas were analyzed, and speed-distance curves were developed for a range of grade profiles. From an evaluation of the speed-distance curves for the designated "critical vehicles" (in the truck and recreational vehicle classes), composite critical length of grade charts were devised using a 55 mph approach speed and a range of speed reduction values. Based on this study these revised design charts are recommended for incorporation into current climbing lane design practice.

  • Supplemental Notes:
    • Sponsored by the State Department of Highways and Public Transportation. Study conducted in cooperation with DOT and FHWA.
  • Corporate Authors:

    University of Texas, Austin

    Center for Highway Research, 200 West 21st Street
    Austin, TX  USA  78712
  • Authors:
    • Walton, C M
    • Lee, C E
  • Publication Date: 1975-8

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 151 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00134762
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: CFHR 3-8-73-20-1F Final Rpt.
  • Contract Numbers: 3-8-73-20
  • Files: NTIS, TRIS
  • Created Date: Jul 22 1976 12:00AM