Im sportlichen Reglement steht zumindest das hier:
48.12 If the clerk of the course considers it safe to do so, and the message "LAPPED CARS MAY NOW
OVERTAKE" has been sent to all Competitors via the official messaging system, any cars that
have been lapped by the leader will be required to pass the cars on the lead lap and the safety
car.
...
Unless the clerk of the course considers the
presence of the safety car is still necessary, once the last lapped car has passed the leader the
safety car will return to the pits at the end of the following lap.
48.12 If the clerk of the course considers it safe to do so, and the message "LAPPED CARS MAY NOW
OVERTAKE" has been sent to all Competitors via the official messaging system, any cars that
have been lapped by the leader will be required to pass the cars on the lead lap and the safety
car.
...
Unless the clerk of the course considers the
presence of the safety car is still necessary, once the last lapped car has passed the leader the
safety car will return to the pits at the end of the following lap.