demolition derby

Demolition derby is usually presented at county fairs and festivals. 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 can be very dangerous. Although serious injuries are rare, they do happen. Drivers are typically required to sign a waiver to release the promoter of an event from liability.  Most demolition derbies are held on dirt tracks or in open fields, that are usually soaked with water. Some drivers use both the front and rear of the vehicle to ram the other competitors.