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Calculating Speed from Heavy Truck Skid Marks
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English
Abstract
Accurately calculating speed from heavy truck skid marks can be difficult. As indicated in SAE article 910126“̈-.an accurate deceleration rate is often an elusive piece of the puzzle.” This paper is intended to add to work done by others in determining heavy truck deceleration rates and calculating speed from skid marks by using different deceleration rates through different portions of each skid length.
Deceleration rates and skid lengths obtained from a test by the Washington Association of Technical Accident Investigators (WATAI)[2] will be used as a basis for an evaluation of the adjusted drag factor method for speed determination. The method is then used to compute truck speeds in a case in which a heavy truck left non-uniform skids of different lengths while braking and evasively steering.
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Citation
Fries, T. and Jones, T., "Calculating Speed from Heavy Truck Skid Marks," SAE Technical Paper 920606, 1992, https://doi.org/10.4271/920606.Also In
References
- Heusser, R.B. “Heavy Truck Deceleration As A Function of Brake Adjustment” SAE Technical Paper 910126 1991
- “Heavy Truck Brake Testing McCord AFB Washington Association of Technical Accident Investigators May 1988
- “Standard No. 121: Air Brake Systems” National Highway Traffic Administration Code of Federal Regulations parts 400 to 999 October 1 1988
- Warner, C.Y. Smith, C.C. James, M.B. Germane, C.J. “Friction Applications In Accident Reconstruction” SAE technical Paper 830612 1983
- Collins, J.C. “Accident Reconstruction” Springfield Thomas Charles C. 1979
- Fricks, L.B. “Traffic Accident Reconstruction” Evanston IL: Northwestern University Traffic Institute 1990