Distance formula The formula for distance if you know time duration and the average speed is. When discussing the term Braking Distance it is typically more interesting to discuss the term Stopping Distance which also includes the reaction time. Distance rate x time.
For example at 20mph the thinking distance is 20 feet at 30mph it is 30 feet and so on.
The Federal Motor Carrier Safety Administration FMCSA calculates the stopping distance of semi-trucks vs. Is the road wet or dry. With a speed of 120 kmh our braking distance calculator gives the value of the friction coefficient equal to 027. This is the distance from your car to the object in front of it.