SC should be moving, groups up the cars, signal for lapped cars to go through pits, lights out on SC and away you go!
1 lap to collect whole field, as much time as necessary for track to be clear/made safe, 1 lap while lapped cars pit = minimal lap wastage.
1 lap to collect whole field, as much time as necessary for track to be clear/made safe, 1 lap while lapped cars pit = minimal lap wastage.