Pipe

A part of a pipe. The driver is piping.

Pipe is a level or an area of a level whose width is smaller than driver's height. That's why the player has to go to a special position in order to get through the pipe. This is done by putting the other wheel on the other side of the pipe (see the picture).

Piping (driving through pipe) is not easy for beginners since the player needs to use turn and rotation keys really carefully to stay alive. The narrower the pipe, the harder it is to drive through it. The minimum width of a pipe is the same as wheel's diameter, but in that case, piping is very hard. The optimal pipe width is usually roughly two wheel's diameters.