On a slightly different track, this is dealing with manual transmissions in the 18 wheeler. When you get to a hill on the interstate, and there is a five-mile downhill that is steep, and they have signs "THREE TRUCK RUNOFF RAMPS NEXT 4 MILES. MAX SPEED 45 MPH."
You better shift down into 7th gear and let that transmission handle that hill. If you try to ride down that steep hill in 10th gear and let the brakes handle it, you won't make it. Your brakes will begins smoking and then will catch on fire. Either you have to eat the runoff ramp, which means you have had a bad day, or else you ride it on down and pull over. Your brakes catch fire, then the tires catch fire and the trailer burns up. Either truck runoff ramp or burned up trailer, your trucking career has come to an end.
