The Lucky dog, also known as the Free Pass, is a NASCAR beneficiary rule. The rule allows the driver of the next lapped car or truck behind the leader to gain back a lap during a caution. The driver is called to move to the end of the longest line of the cars at the end of that caution period. This rule was instituted to prevent drivers from racing back to the start/finish line when a caution was called. The rule applies regardless of the number of laps a car is behind the leader. Furthermore, a driver may not receive a beneficiary rule lap in certain situations: