Indianapolis 500

The Indianapolis 500-Mile Race, often shortened to Indianapolis 500 or Indy 500 or sometimes known simply as The 500, is an American automobile race, held annually over the Memorial Day weekend at the Indianapolis Motor Speedway in Speedway, Indiana. The event lends its name to the IndyCar class, or formula, of open-wheel race cars that have competed in it.

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- The Indy 500 itself, however, remained under the sanctioning control of USAC. It became the lone top-level race the body still sanctioned, as it ultimately dropped all other Indy car races to concentrate on sprints and midgets. For the next three years, the race was not officially recognized on the CART calendar, but the CART teams and drivers comprised the field. By 1983, an agreement was made for the USAC-sanctioned Indy 500 to be reflected on the CART calendar, and CART points were awarded towards the championship.

Technical specifications for the Indianapolis 500 are currently specified by the Indy Racing League. Rules are the same as every other IRL IndyCar race except for special low-drag adjustable "Speedway" wings that are only used for the Indy 500. In the past, especially during the years when USAC sanctioned the race but CART was the dominant sanctioning body, rules between the race and the sanctioning body differed at times, resulting in chassis and engines being legal for Indy, yet not being legal for other events that season.