Form of motor racing in which two contestants race side by side from a standing start over a straight quarter-mile strip of pavement. Winners go on to compete against others in their class until only one is left undefeated. There are three main classes of vehicle: (1) the Top Fuel Eliminator (called a "rail" or "slingshot"), a lightweight, long-chassied vehicle with wide rear tires that is fueled by a special mixture, such as methanol and nitromethane; (2) the "funny car," a high-performance copy of a late-model production car that uses special fuel; and (3) the standard production car, a modified version of a gasoline-powered production car. The Top Fuel class is the fastest, followed by the funny car. Drag racing is most popular in the U.S
The operation of two or more vehicles from a point side by side at accelerating speeds in a competitive attempt to out-distance each other, or the operation of one or more vehicles over a common selected course, from the same point to the same point, for the purpose of comparing the relative speeds or power of acceleration of such vehicle or vehicles within a certain distance or time limit