Demolition derby is a non-racing motorsport 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 originated in the United States and quickly spread to other Western nations. For example, Australia's first demolition derby took place in January 1963. In the UK and parts of Europe, demolition derbies (sometimes called "destruction derbies") are often held at the end of a full day of banger racing. In demolition derbies, serious injuries such as whiplash are rare but they do happen. Drivers are typically required to sign a waiver to release the promoter of an event from liability. At almost all derbies, attempts are made to make the event safer, all glass is removed from the vehicles, and deliberately ramming a driver's-side door area is forbidden. The driver's door is often required to be painted white with black numbers or blaze orange, or with contrasting colors, for visibility. Most demolition derbies are held on dirt tracks, or in open fields, that are usually soaked with water. This causes the competition area to become muddy, which helps to slow the vehicles. The part of the vehicle used to ram opponents varies; some drivers use both the front and rear of the vehicle to ram the other competitors, while others tend to use only the rear end of the vehicle to protect the engine compartment from damage. History Demolition derbies were first held at various fairs, race tracks, and speedways by independent promoters in the 1950s. There are unconfirmed reports of events occurring as far back as the 1930s utilizing the abundant supply of worn-out Ford Model Ts. The originator of the concept for auto demolition derbies is disputed. One source says that Don Basile is often credited with inventing the demolition derby at Carrell Speedway in 1947. Another source states stock car racer Larry Mendelsohn created the concept for demolition derbies at New York State's Islip Speedway in 1958 after realizing many people favored wrecks to racing. The sport's popularity grew throughout the 1960s, becoming a standard at county fairs and becoming a subculture nationwide. The popularity of demolition derbies also spread overseas. In 1963 a reported crowd of 20,000 packed into the Rowley Park