axle

The rules say if the driver on the inside has his front axle ahead of the car outside him at the apex of the corner, he does not need to give his rival any room on the exit.

The prosecution alleges he was hiding underneath in a makeshift sling near the rear axle.

It states the driver on the outside in this sort of situation must "have the front axle at least alongside the front axle of the other car at the apex of the corner and to the exit" to be entitled to be afforded room.

This might be used to drive an axle and turn the wheels of an electric car, for example.

“So I added an electric axle to power a fifth and sixth wheel. Then I figured out a way to extend the axles so the back four wheels were moving in unison.”