In the IndyCar Series, lapped cars ahead of the leader following pit stops (which may happen if a lapped car does not pit during yellow when the lead lap cars do so) are allowed to move to the tail end of the lead lap on restarts on the one lap to go signal—which automatically closes the pit lane until the restart. This ensures that the leaders take the green flag without interference from lapped traffic. NASCAR follows the same policy with the 2009 change to the Beneficiary Rule, except that pit lane is only closed to those cars that were waved around the safety car to allow the leaders to start at the front.