Calculation of Travel & Crash Impact Speed
Motorcycle Roadway Evidence
Roadway evidence are items such tire skid mark distance, gouge marks, post-impact travel distance, yaw mark geometry, vault distance and fall distance. Special motorcycle roadway evidence can include rider vault distance, motorcycle slide distance, rider slide distance and gouge marks in the roadway indicating motorcycle lean angle.
The roadway and vehicle evidence can be analyzed together to calculate pre-impact and impact speeds in a reconstruction for a motorcycle crash or other vehicle crash. These calculations are based upon principles such as Conservation of Momentum and Conservation of Energy.
If an analysis of a motorcycle or vehicle’s speed is desired, 830 Engineering can complete that analysis.
A simple reconstruction involves how far a vehicle will take to skid to a stop form an initial velocity as shown here:
|Speed (mph)||f = 0.75||f = 0.90||f = 0.30||f = 0.50|
Notes: The terms used to describe the road surface (asphalt, concrete, snow, gravel) and the associated drag factors (f), are very general. They do NOT apply to all roads or crashes.