The Uncertain Factor Method for Vehicle-velocity Estimate in Traffic Accident

There are many uncertain factors in a road traffic accident.According to these factors, the pre impact velocity of a vehicle can be estimated with some ucertainties. The Uncertainty Theory is utilized to calculate the uncertainty and extremum of the estimated velocity.From the factors mentioned above, a factor is selected as the uncertain factor, which has the most influence on velocity results.Then the uncertain factor is utilized to ascertain an error limit or a value scope of the vehicle velocity.The friction coefficient and the pre impact velocity of the impacted vehicle are considered as the uncertain factors, upon that the method is practiced in the algorithm of kinetic energy and momentum equation.