Understand F1 flags

 Finish of the race  Tells the driver he is about to be lapped and to let the other car overtake.
 Warns the competitors that the track is slippery  Indicated end of danger and of ban on overtaking
 Car has dangerous mechanical problem and must go to its pit  Indicated danger & overtaking is prohibited. One waved yellow flag=slow down, 2 waved =slow down & prepare to stop if necessary.
flag-7 Accompanied by the number of a car warning for unsporting behavior  Session stopped in the interest of safety