


To explain more how do the blue flags go in the ground: If that does not happen, accidents like the one in Brazil 2018 when an unlapped car hit the race leader (Verstappen) might destroy race the leader's race and pace and concur in actions and sanctions by Race Direction to the unlapping car for creating an accident. Of course that can happen, but the unlapping car has to be aware that its actions can concur on changing the race results and so has to be very cautious when trying to unlap and make it clear to the race leader. It is not normal that backmarkers try to unlap themselves because normally they do not have the speed. Usually in a Formula 1 perspective, Blue Flags are waved to slower cars that are about to become lapped by the leader or someone else.
