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Demolition derby is a 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. In Europe, this type of event is called banger racing, although in a demolition derby, racers do not race against each other, instead aiming specifically to destroy the other cars.
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. 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 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 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.
Demolition derbies were first held at various fairs and 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 T's. The originator of the concept for demolition derbies is disputed. One source said 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 of county fairs in rural areas, and becoming a quirky subculture nationwide. In 1965 a reported crowd of 20,000 packed into Rowley Park Speedway to see Australia's first demolition derby. ABC's Wide World of Sports televised the World Championship Demolition Derby from the mid 1960s until 1992. Also in 1972, the Los Angeles Coliseum hosted a demolition derby with mint-condition late model cars driven by Mario Andretti, A. J. Foyt, and Bobby Unser. The popular ABC sitcom Happy Days included the character Pinky Tuscadero, a professional demolition derby driver and occasional love-interest to the show's most popular character, Arthur Fonzarelli.
The sport's popularity peaked in the 1970s. By the 1980s, the sport's popularity began to level off, and then possibly decline throughout the 1990s. With the demise of Wide World of Sports, television exposure became virtually non-existent. In addition to safety concerns and the shortage of full-size vehicles, some felt that the sport has shown little change or innovation beyond its original premise of giant lumbering cars sloshing through mud.
In 1997, The Nashville Network (later part of CBS) returned demolition derby to national television in its "TNN's Motor Madness" series of various motor-sport events. The demolition derby was originally designed to serve as an amusement while attendees bought food and beverage from 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. However, as part of MTV Networks' takeover of CBS Cable operations in 2000, demolition derbies, as well as the rest of the CBS motor-sports operations, were removed from programming as part of MTV's move to shut down the CBS Charlotte operation based at Lowe's Motor Speedway and generalize the network into a more broadly viewed channel. Pay per view was demolition derby's only national television outlet in the 2000s (decade). Two $50,000-to-win derbies were held in Widewater, Canada from 2000-2001.
Later in the 2000s (decade), a proliferation of cable television shows about vehicle customizing occasionally showcased junked vehicles in bizarre competitions. Spike TV's "Carpocalypse"  was a reality documentary series on variations of demolition derby filmed in Orlando, Florida. The Speed Channel also has aired Team demolition derbies in 2005. Cable TV's exposure has led to renewed interest in the demolition derby.
In 2006, the partners of Mike Weatherford Promotions (Mike Weatherford and Dustin Swayne) brought DerbyMadness.com to life while promoting the NAPA Auto Parts Crash for Cash Series. The First Annual final show paid out $5,000.00 to the winner of the series. Before competing in the final show, derby drivers across several states had to qualify at any one of the participating NAPA Crash for Cash qualifying derbys. There were over 100 cars in the final show. The Series was a huge success and continues to grow every year. The 2007 Series Money was doubled, so competition was expected to increase for the 2008 series.
Competitors have traditionally used full-size, American made sedans, and station wagons, especially those from the 1960s and 1970s, which were larger, heavier, and had more robust frames than later full-size vehicles. The 1964-1966 Chrysler Imperial achieved near-legendary status for its crashworthiness, and is still banned from most derby events. Scrap vehicles are purchased from junkyards and private owners, usually for less than US$500, though some select (and rust-free) mid-1970s sedans and station wagons may go for more than $1,000. A vehicle may be patched up and re-used for several events.
With the dwindling availability of these older vehicles, smaller full-sized vehicles of the 1980s and 1990s are more frequently encountered today. A separate class of demolition derby for compact cars is increasing in popularity. Compact car events have the advantages of an abundant supply of usable vehicles, which also tend to be more mobile and thus, more entertaining to fans. Being largely front-wheel drive vehicles, their back ends can sustain considerable amounts of damage before the vehicle is immobilized. However, this increased speed, coupled with the fact that compact cars tend to be less crashworthy, makes injuries more frequent.
Other versions of the sport using combine harvesters and lawn mowers have been practiced in various parts of the world. Larger vehicles, such as pickup trucks and SUVs, were rarely used in demolition derby (though school bus demolitions have long been a popular exception), but have recently become popular in demolition events. Recently a new class for minivans has been added to some derbies because of the abundance of older vehicles.
The vehicles are stripped of interior fixtures, trim, plastic, lights, and glass. They are repainted, often in loud, garish designs and low budgets (spray paint is frequently used to mark names, slogans and identification). The driver's-side door is usually painted a distinct white color, to allow the other drivers to avoid it and to allow numbering. Additional modifications include trimming sheet metal from around the wheel wells, removing parts of bumpers, welding the doors shut, and relocating the battery and gas tank. The radiator is sometimes relocated to the back seat. To make the cars last longer, they are occasionally pre-bent, frames notched, rear bumper removed, trunk lid notched, and rear coil springs are (when rules allow) replaced with leaf springs. In many instances, roll bars, fire extinguishers, and other safety equipment is installed. Sometimes the removed parts create bulk availability of off-color parts for older cars that are compatible with them. In most cases, any vehicle parts must be "stock," though in some derbies a "gladiator" or "outlaw" division allows cars to be extensively modified and reinforced.
In 2001, the Los Angeles Times estimated that between 60,000 and 75,000 drivers participated in at least one of the 2,000 demolition derbies held in the United States that year. Event purses rose from hundreds of dollars to over $10,000 after the popularity of TNN's Motor Madness series.
Derbies have many different sets of rules, usually pertaining to how much welding can be done to the vehicle, and the class of car(example: compacts, trucks, minivans, fullsize(some rules are 1980 and newer)etc.. Drivers are often required to be at least 16 years old. They are required to have seat belt and a helmet, and depending on sets of rules roll over bars and cages inside the vehicle. An event usually begins with drivers lined up on the track facing rear to rear, or circling on an oval track. Drivers are usually required to crash into another vehicle every 2 minutes or they are labeled as "sandbagging" and become disqualified, there is also a "maddog" which is the car giving the best show(most hitting, biggest hits, rollovers, etc). Hitting a driver intentionally in the drivers door and sometimes rolling another car intentionally, are also grounds for disqualification. The last running car that makes contact with another driver wins the event.;The time it takes for one of these events varies, depending on if the derby being run has multiple heats and feature, or just a single heat. Normal heats last anywhere from 10-30 minutes, while an entire even can take place over the span of a few days(such as Metal Mayhem ran by Derby Icons in Illinois). Depending on the sanctioning body, it may be illegal for multiple cars to collaborate and gang up on opposing cars in a sandwich effort, and could result in disqualification for both parties that do so; the enforcement of this rule varies widely.
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.
Various classes of vehicles have competitions staged on figure 8 shaped tracks. Bump To Pass Figure eights are also quite popular as they involve less prep work from the usual figure eight racer which usually can also race as an oval track street stock. Demolition derby vehicles - especially school buses - often compete on figure 8 tracks. The best known figure 8 track in the US is Riverhead Raceway in Riverhead, New York.
Junked vehicles are also destroyed for entertainment at monster truck competitions, so demolition derbies are often staged there as a preliminary event. The rise in popularity of monster truck competitions, beginning in the 1980s is sometimes cited as coming at the expense of demolition derby popularity. While derbies featured mostly local amateur talent, monster trucks popularized a new set of competitors and vehicles recognized nationwide by fans.
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