The Indianapolis 500 auto race has used a pace car every year since 1911. The pace car is utilized for two primary purposes. At the start of the race, the pace car leads the assembled starting grid around the track for a predetermined number of unscored warm-up laps. Then if the officials deem appropriate, it releases the field at a purposeful speed to start the race. In addition, during yellow flag caution periods, the pace car enters the track and picks up the leader, bunching the field up at a reduced speed.