The Demo Derby is a different kind of motorsport usually found at county fairs all around the USA. While rules vary from event to event, the typical demolition derby event consists of five or more drivers competing by deliberately ramming their vehicles into one another. The last driver whose vehicle is still operational is awarded the victory.

Demolition derbies originated in the United States and quickly spread to other western nations. In Europe, racers do not race against each other, instead aiming specifically to destroy the other cars.

To make the event safer, all glass is removed from the vehicle, and deliberately ramming the driver’s-side door area is forbidden. The driver’s door is often required to be painted white with black numbers or with contrasting colors, for visibility.

Most demolition derbies are held on dirt tracks or in open fields and are usually soaked with water. This causes the competition area to become muddy which in turn helps to further slow the vehicles.

Some drivers use both the front and rear of the vehicle to ram the other competitors. Others tend to use only the rear end of the vehicle, to help protect the engine compartment from damage.