STUDY OF MODELS FOR THE PREDICTION OF AVERAGE ROAD LOAD OF IN-USE DELIVERY TRUCKS

Coast-down studies of Class 6 trucks (19,500 to 26,000 lb gross vehicle weight) were conducted at near-zero road grade and wind conditions. Speed-versus-time data were recorded, smoothed to a quadratic equation to calculate deceleration rates and reduced by the ordinary least-square method using two, three, and five-parameter linear models. The estimated parameters were analyzed statistically and compared to the U.S. Environmental Protection Agency (EPA) recommended procedure. The averages of the individual truck road loads for the two, three, and five-parameter models were consistent within 4% when reference conditions of 40 mi/h, 15,000 lb weight, and 65 ft sq. projected frontal area were used. (Copyright (c) 1983 Society of Automotive Engineers, Inc.)

• Corporate Authors:

  Northrop Services, Incorporated

  Research Triangle Pk, NC  United States 
• Authors:
  • Cha, S
  • Sloan, R L
  • Black, F M
• Publication Date: 1983

Media Info

• Pagination: 22 p.

Subject/Index Terms

• TRT Terms: Deceleration; Delivery service; Estimating; Least squares method; Loads; Mathematical models; Quadratic equations; Trucks
• Subject Areas: Highways; Motor Carriers; Operations and Traffic Management; Society; Vehicles and Equipment; I71: Traffic Theory;

Filing Info

• Accession Number: 00385441
• Record Type: Publication
• Report/Paper Numbers: EPA-600/J-83-132
• Files: TRIS
• Created Date: Jun 28 1984 12:00AM