The green flagRace tracks have long used flags as a way for marshals to communicate with drivers. The colour and meaning of... There's more... signals that the track is clear and drivers can race. The flag is used at the pit exit to signal the track is open, it is waved at the back of the fieldThe field is a reference to the full grid of cars, from pole to the backmarkers. Consider it in the... There's more... on the starting gridThe grid is a reference to the starting order of the race is typically determined by qualifying, however, with the... There's more... to signal that the cars are in their starting positions and after a yellow flagThe Yellow flag is possibly the most important and most used flag during a race. It is used to inform... There's more... incident to signal drivers may resume racing.