Flags & Signals

A single yellow flag means caution and no overtaking in that zone, because there's a hazard just ahead. A double yellow raises that warning further, for a bigger hazard or marshals working on the track, and usually means slowing down noticeably rather than just easing off.

A blue flag is shown to a driver who is about to be lapped, telling them a faster car is closing and they should let it through at the next reasonable chance rather than holding it up.

A red flag stops the session entirely, for a serious incident, dangerous weather, or a blockage that can't be cleared safely under yellows. Cars head back to the pits or grid and the session is paused until it's safe to restart.

The chequered flag simply ends the session, waved at the leader as they complete the final lap and then at every car behind as it crosses the line.