Monaco Grand Prix in the context of FIA

The 24 Hours of Le Mans (French: 24 Heures du Mans; French pronunciation: [vɛ̃t.katʁ‿œʁ dy mɑ̃]) is an endurance sports car race held annually near the city of Le Mans, France. It is widely considered to be one of the world's most prestigious races, and is one of the races – along with the Monaco Grand Prix and Indianapolis 500 – that form the Triple Crown of Motorsport, and is also one of the races alongside the 24 Hours of Daytona and 12 Hours of Sebring that make up the informal Triple Crown of endurance racing. Run since 1923, it is the oldest active endurance racing event in the world.

Unlike fixed-distance races whose winner is determined by minimum time, the 24 Hours of Le Mans is won by the car that covers the greatest distance in 24 hours. The cars on this track are able to achieve speeds of 366 km/h (227 mph), and reached 407 km/h (253 mph) on the Mulsanne Straight in 1988 – instigating the addition of more chicanes to the track to reduce speed reached. Racing teams must balance the demands of speed with the cars' ability to run for 24 hours without mechanical failure. The race is organized by the Automobile Club de l'Ouest (ACO). It is held on the Circuit de la Sarthe, composed of closed public roads and dedicated sections of a racing track.

Formula One, abbreviated to F1, is the highest class of open-wheeled auto racing series managed by the Fédération Internationale de l'Automobile (FIA), motorsport's world governing body. The "formula" in the name alludes to a series of FIA rules to which all participants and vehicles are required to conform. The Formula One World Championship season consists of a series of races around the world, known as Grands Prix, usually held on purpose-built circuits, and in a few cases on closed city streets. Each Grand Prix meeting lasts three days with either one or three practice sessions before a three-part qualifying session on Saturday to set the starting order for Sunday's race. A Saturday sprint is held at select events, with the starting grid determined by a separate, shorter qualifying session held on Friday. Grands Prix are frequently named after the country, region or city in which they are raced, and in some seasons, nations have hosted more than one event. Should Formula One hold two or more races in the same nation in the same year, on either a different or the same track, then their names will be different. The results of each Grand Prix held throughout the season are combined to decide two annual championships, one for drivers and one for constructors.

Grand Prix distance regulations have varied throughout Formula One history. Between 1950 and 1957, events ran for more than 300 km (190 mi) or three hours. In 1958, race lengths were set between 300 and 500 km (190 and 310 mi) or two hours. It was reduced to between 300 and 400 km (190 and 250 mi) from 1966 with an established maximum length of 321.87 km (200.00 mi) in 1971. From 1973 to 1980, races had to last either 321.87 km (200.00 mi) or two hours, whichever came first. Distances of between 250 and 320 km (160 and 200 mi) or two hours were used from 1981 to 1984. The minimum distance was revised to 300 km (190 mi) including the formation lap in 1984 and the maximum length was standardised at 305 km (190 mi) in 1989. The exception to the rule is the Monaco Grand Prix, which has a scheduled length of at least 260 km (160 mi). No race can last more than two hours if it goes unhalted. From 2012, the maximum permitted race time including probable stoppages was four hours, before being reduced to three hours for 2021.

The Indianapolis 500, formally known as the Indianapolis 500-Mile Race, and commonly shortened to Indy 500, is an annual automobile race held at the Indianapolis Motor Speedway in Speedway, Indiana, United States, an enclave suburb of Indianapolis. The event is traditionally held over Memorial Day weekend, usually the last weekend of May. It is contested as part of the IndyCar Series, the top level of American open-wheel car racing, a formula colloquially known as "Indy car racing". The track itself is nicknamed the "Brickyard", as the racing surface was first paved in brick in the fall of 1909. One yard of brick remains exposed at the start/finish line. The event, billed as The Greatest Spectacle in Racing, is considered part of the Triple Crown of Motorsport along with the 24 Hours of Le Mans and the Monaco Grand Prix, with which it has frequently shared a date.

The inaugural race was held in 1911 and was won by Ray Harroun. The event celebrated its 100th anniversary in 2011, and the 100th running was held in 2016. The event was put on hiatus twice, from 1917 to 1918 due to World War I and from 1942 to 1945 due to World War II. In two different periods, the race was part of FIA World Championships; between 1925 and 1928, the World Manufacturers' Championship and between 1950 and 1960, the World Drivers' Championship.