It all depends if you find the actual skid marks of the vehicle that hit the person crossing the road. Once the skid marks of the asphalt are measure by the investigating officer, he will enter the measurement found into an actual computing math solution that will give him the result of how fast the vehicle was traveling. Now, if the skid marks don't exist or could not be found than the officer will use any witness that can give him a true statement--for the accident to see if the vehicle was be driven in a high rate of speed. In Texas if the vehicle was speeding the driver be held at fault, however, if the person was j-walking or crossing the middle of street he can also be found at fault--perhaps a " civil matter and let the court decide who at fault". later
1/2 a foot per mile
thank you
Calculus