Most of the information regarding truck speeds on grades prior to this research project was obtained more than twenty years ago. It was probable that truck operating characteristics had changed significantly. The speeds of more than 14,000 trucks and of more than 2,600 recreational vehicles, pickup trucks, vans, and other vehicles were measured on grades along rural freeways and expressways in California during 1977, 1978, and 1979. The truck speed measurements included sustained speeds on grades, speeds while decelerating on grades, and speeds while accelerating on a -0.14 percent grade. The truck speed information was used to prepare calculated deceleration curves for trucks on grades. The sustained speeds were used for the calculations, and the measured deceleration speeds were used to determine that the caculated speeds were similar to the measured speeds.
Truck Speeds on Grades in California
1979
67 pages
Report
No indication
English
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