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The Rolex 24 at Daytona (frequently referred to by its historical title, the 24 Hours of Daytona) is a 24-hour sports car endurance race held annually at Daytona International Speedway in Daytona Beach, Florida. It is held on a 3.56-mile (5.73 km) combined road course, utilizing portions of the NASCAR tri-oval and an infield road course. Since its inception, it has been held the last weekend of January or first weekend of February, part of Speedweeks, and it is the first major automobile race of the year in the United States.The race has had several names over the years. Since 1991, the Rolex Watch Co. is the title sponsor of the race under a naming rights arrangement, replacing Sunbank (now SunTrust) which in turn replaced Pepsi in 1984. Winning drivers of all classes receive a steel Rolex Cosmograph watch.

In 2006, the race moved one week earlier into January to prevent a clash with the Super Bowl, which had in turn moved one week later into February a few years earlier. In effect, these two major events switched dates.24 Hours Daytona Race
As in the Spa 24 Hours (introduced in 1924) and the 24 Hours Nürburgring (1970), the purpose of the event is to determine which team of drivers can take their sports car the farthest in a fixed time period, rather than the shortest time over a fixed distance as in most conventional auto races.

Unlike the Le Mans event, the Daytona race is conducted entirely over a closed course within the speedway arena without the use of any public streets. Most parts of the steep banking are included, interrupted with a chicane on the back straight and a sweeping, fast infield section which includes two hairpins. As unlike Le Mans, the race is held in wintertime, when nights are at their longest. Lights installed around the circuit to allow night racing (and prime-time television coverage) although the infield section still not as well-lit as the main oval. However, the stadium lights are turned on only to a level of 20%, similar to the stadium lights at Le Mans, where the track is lit similarly, with brighter lights around the pit straight, and decent lighting similar to street lights around the circuit.

A car must cross the finish line after 24 hours to be classified, which leads to dramatic scenes where damaged cars wait in the pits or on the edge of the track close to the finish line for hours, then restart their engines and crawl across the finish line one last time in order to finish after the 24 hours and be listed with a finishing distance, rather than dismissed with DNF (Did Not Finish). This was the case in the initial 1962 Daytona Continental (then 3 hours), when Gurney’s Lotus had established a lengthy lead when the engine died, and he parked it at the top of the banking, just short of the finish line. When the three hours had elapsed, Gurney drove the car the last few feet across the finish line using gravity, to not only salvage a finishing position, but actually win the race.

Daytona Gts cars

The Gran Turismo class cars at Daytona are closer to the road versions, similar to the GT3 class elsewhere. For example, the more standard Cup version of the 996 is used, instead of the usual RS/RSR racing versions. Recent Daytona entries also include BMW M3s, Corvettes, Mazda RX-8s and Pontiac GTO.Rs.

In an effort for teams to save money, GT rules have now changed to permit spaceframe cars clad in lookalike body panels to compete in GT (the new Mazda for example, and the forthcoming Infiniti G35). These rules are somewhat similar to the old GTO specification, but with rather more restrictions.

The intent of spaceframe-clad cars is to allow teams to save money — especially after crashes, where teams can rebuild the cars for the next race at a much lower cost, or even redevelop cars, instead of having to write off an entire car after a crash or at the end of a year.

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