Although the speed of a vehicle can be determined by the length of it's skid marks, the grade of the road and the condition of the tires must also be considered. Also, if the vehicle was still moving at the time of the impact, skid/speed formulas will only yield the minimum "original" speed.

The form above is designed to estimate the speed of the vehicle based on general surface conditions. It should not be used as a substitute for a proper accident reconstruction investigation.

Speed = √(30 x CD x Length)