Federal regulation limits interstate truck drivers to 10 hours of driving after an 8-hour off-duty period. To estimate the percentage of hours of service violators among long-haul tractor-trailer drivers, truck drivers were interviewed at an inspection station in Spokane, Washington and later observed arriving at inspection sites in either Moorhead or Worthington, Minnesota (approx. 1,200 miles). The percentage of drivers violating the hours of service rules by more than one hour at average trip speeds ranging from 35 mph to 65 mph are represented. Assuming that the drivers averaged 40 mph over the complete course of the trip segment, including stopped time, 90% were in violation by more than one hour. These speed assumptions are based on findings in the current study that team drivers averaged 38 mph, fleet managers' reports of scheduling single drivers at trip speeds of 45 mph to 47 mph, and reports in the literature that loaded tractor-trailers average 41 mph over flat terrain. Although the true percentages cannot be determined without knowing actual trip speeds, the estimated range of violators at probable speeds of 40 mph and 50 mph points to a substantial problem.

  • Availability:
  • Corporate Authors:

    Pergamon Press, Incorporated

    Headington Hill Hall
    Oxford OX30BW,    
  • Authors:
    • Hertz, R P
  • Publication Date: 1991-2

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00605122
  • Record Type: Publication
  • Report/Paper Numbers: HS-041 048
  • Files: TRIS, ATRI
  • Created Date: Mar 31 1991 12:00AM