Demolition Derby

The demolition derby was originally designed to serve as an amusement while attendees bought food and beverage from track concessions. Motor Madness derbies were primarily for broadcast and needed to fit into a time frame. Live demolition derbies could last as long as possible. Motor Madness changed the rules from last car running to largest number of offensive hits in a time frame, and thereby helped prevent sandbagging, since sandbagging would result in a lower score.
Rollover competitions
Also included at many demolition derbies in the US and UK are rollover competitions, where the object is to drive a car so that only the wheels on one side hit a ramp, causing the vehicle to roll over repeatedly. Drivers take multiple runs at the ramp until their vehicle dies. The driver who completes the most rollovers before their vehicle ceases to function is declared the winner. Compact cars, especially hatchbacks, are used in rollover competitions. Their lighter weight enables them to roll more easily than larger vehicles. However, with modern high-horsepower unibody sedans and coupes now appearing on salvage lots, some of this conventional wisdom is being questioned and some major competitions have been won by drivers of mid-size and full-size sedans.