A rolling start is a type of start in an autoracing race, in which the cars are led at a certain speed by the safety car, before being allowed to accelerate at a certain point just before the start line. Motorsports utilising a rolling start include NASCAR and several worldwide touring car championships. Rolling starts have sometimes been deemed unfair, and on occasion are considered dangerous if drivers are too aggressive around the time the signal to "Go" is given. Auto racing (also known as automobile racing or autosport) is a sport involving racing automobiles. ... Mercedes-Benz supplies its AMG models to the Formula One Championship as safety cars The F1 Safety Car outside of its garage in the pitlane at the 2005 US Grand Prix In auto racing, a safety car (known in America as the pace car) is a car which limits the... The National Association for Stock Car Auto Racing (NASCAR) is the largest sanctioning body of motorsports in the United States. ... Horatio Nelson Jackson in his 2-seat Winton touring car, The Vermont, drives across America A touring car was a popular car body style in the early 20th century, being a larger alternative to the runabout. ...

Rolling starts are often accompanied by several rules to prevent drivers from getting an unfair advantage during the start of the race. For example, in NASCAR, drivers on the inside line cannot overtake cars on the outside until they have passed the start line. Other rules often used include not being able to pass the start line before the signal to "Go" is given (to prevent drivers on the front row from accelerating too soon), and not being able to be above a certain speed as the signal to "Go" is given (to prevent accidents and gaining an advantage early in the race).

Formula sports tend to not use a rolling start, mostly because of the physics and technology behind the sport (for example, being too close to the car in front for too long can cause overheating and engine problems), but also because of the quicker acceleration times, and bigger dangers behind accidents within the sport. However, the Indy Racing League and Champ Car do use rolling starts although Champ Car will be transitioning to standing starts on certain road and street courses that are deemed to have enough room to safely do so. An engine is something that produces some effect from a given input. ... Indy Racing League Logo The Indy Racing League, better known as IRL, is the sanctioning body of a predominantly oval based open-wheel racing series in the United States and, more recently, Japan. ... Champ Car, a shortened form of Championship Car, has been the name for a class of cars used in American Championship Car Racing for many decades. ...

The opposite of a rolling start is a standing start. A standing start is a type of start in autoracing events, in which cars are stationary when the race begins. ...