Abstract
The distance it takes for drivers to come to a complete stop after braking was measured in order to find out the various braking distances of drivers. The experiment was carried out by candidates from the general public (regular drivers) with ages ranging from 20 to 70 as well as Japan Safe Driving Center trainees. Deceleration and braking pressure were also measured in the experiment to find out the differences between each driver's emergency braking technique. Braking distance is influenced by velocity and road conditions. Therefore, braking distance results were assessed by comparing them with the ideal braking distance in the field of experiment, and also comparing them with the predicted braking distance for the particular road condition. Most of the braking distance results were distributed above the predicted braking distance and in some cases were up to twice of the predicted braking distance. The trainees' braking distance results were shorter than that of the regular drivers. The age did not affect the result. The differences in braking distances mainly depended on the maximum braking pressure. Although there were differences in each driver's maximum braking pressure and braking speed, there were little differences in the form of braking pressure.
