Braking is the science of turning kinetic energy into heat. The faster you can do it and the more repeatable your equipment the better at braking you'll be. This test was done with the truck alone from a speed of 60 MPH down to zero, and repeated four times. Here it's important to record not just the minimum stopping distance but the average of the runs, as repeated stopping induces brake fade, a condition where that transfer of kinetic energy to heat can no longer take place as the brakes are too hot. Once again, the trucks are outfitted with Ricardo measuring equipment and operated by the same driver, all safety systems are active.