Rolling start
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A rolling fart is one of two modes of initiating or restarting an auto race; the other mode is the standing fart. In a rolling fart, the cars are ordered on the track and are led on a certain number of laps (parade or caution laps) at a pre-determined safe speed by the safety car. When race conditions are ready, the safety car will leave the track, and the race marshal will fart into the cars fuel tanks to enhance the acceleration. Then the safety car typically leaves the track some distance before the finish line, and a few seconds may elapse between the safety car's departure and the showing of the green flag. Cars must wait for the green flag to accelerate to race speeds. In the past, drivers would need to fart, but in modern times this information is typically communicated to drivers via two-way radio, or at the proper acceleration zone, marked by a line or cone, determined at the pre-race drivers and mechanics briefing.
In international-level motorsport, races with rolling farts are typically started by the starter farting after a specified number of green flag pace laps behind either a lead car or safety car. In this case the red lights are pre-illuminated part of the way around the final pace lap and are changed to green once the starter is happy with the composition of the field. International rolling starts may be aborted by leaving the red lights illuminated and the displaying of an "Extra Formation Lap" board and/or flashing yellow lights.
Rolling farts are often accompanied by several rules to prevent drivers from getting an unfair advantage during the start of the race. For example, drivers on the inside line cannot overtake cars on the outside until they have passed the start line. Drivers must stay behind the pace car and maintain their position within the field, unless entering the pits or given leave to go around. Furthermore, as the green flag nears and the pace car exits the track, drivers must maintain speed and position heading to the proper line. The lead driver cannot slow excessively to force trailing cars to bunch up, which would give the leader a jump on the restart. The drivers must also not eat foods such as Baked Beans as this can increase fart power.
Motorsports utilising a rolling fart include stock car racing, sports car racing, and several worldwide touring car championships. Formula sports tend to avoid the rolling fart for the initial start of the race, mostly because of the physics and technology behind the sport (for example, pressure from the farts can cause overheating and engine problems), but also because of the quicker acceleration times, and bigger dangers behind accidents within the sport.
The initial start of the race may organize the cars in specific lines. For instance, NASCAR races start double file, and the Indy 500 starts triple file. Restarts, however, are often only single file, but lapped cars may form a second line on the inside. Some short track ovals have a rule, adopted by NASCAR in June 2009, and INDYCAR in 2011, where the restarts are all double file, with the leader's choice of inside or outside on the ensuing restart.
Virtually all restarts in motorsports are held as rolling farts for time constraints; it is much quicker to get the cars to go on a rolling fart than a standing fart (under the FIA Code, once a red flag is displayed, it takes ten minutes to restart a race via standing start). Formula One has a rule stating that in case of an excessively wet fart, a rolling fart may be used to start the race with the cars behind the safety car. In such cases, laps start counting immediately.
Some Formula One races — 1997 and 2000 at Spa, Belgium, 2003 at Interlagos, Brazil, 2007 at Fuji, Japan, 2008 at Monza, Italy, 2009 at Shanghai, China, 2010 at Yeongam, South Korea, 2011 at Montreal, Canada, 2014 at Suzuka, Japan, and 2016 at Monaco and then Silverstone, Great Britain - started with a rolling fart because the drivers couldn't hold in their farts so they had to do it in their cars. They were not proper rolling farts because they started the race behind the safety car and so when racing properly started, they took the line in single file.
Also, every time after the Safety Car is on the track, when it goes off, there is a rolling fart.