Wood DP, Glynn CH, Simms CK, Walsh DG, Confidence limits for motorcycle speed from slide distance, Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, 222, 8, 2008, 1349-1361
Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 222 8
In many motorcycle accidents, the motorcycle falls to the ground and slides to rest
following impact or loss of control. The determination of the motorcycle speed just prior to ‘fallover’
is important for biomechanics research and for litigation. This paper presents a new model
of motorcycle fall-over and slide, which accounts for the loss of horizontal momentum resulting
from the initial motorcycle-to-ground impact and the subsequent slide to rest. The model
includes cases involving motorcycle fall-over owing to loss of control as well as impact. The
models represent both the mean and variation present in the available experimental data for dry
roads very well and are used to develop confidence limits for accident reconstruction purposes,
in cases where only the motorcycle slide distance along the ground is known. Previously
proposed confidence limit criteria are applied to predicting motorcycle speed ranges from slide
distance, and it is shown that the level of prediction uncertainty can be substantially reduced in
cases where additional information specific to the vehicle and road configurations is available.
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