pace car

n. (Automobile Racing) car leading the group of competing cars around the course before the race starts and then pulls off the course

In motorsport, a safety car or pace car is a car which limits the speed of competing cars on a racetrack in the case of a caution period such as a major accident or obstruction on the track. During a caution period the safety car enters the track ahead of the leader. With few exceptions, competitors are not allowed to pass the safety car or other competitors during a caution period, and the safety car leads the field at a pre-determined safe speed, which may vary by series and circuit. At the end of the caution period, the safety car leaves the track and the competitors may resume racing.
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Noun
1. a high-performance car that leads a parade of competing cars through the pace lap and then pulls off the course
(hypernym) car, auto, automobile, machine, motorcar
(classification) auto racing, car racing

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