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NASCAR utilizes flags for the purpose of providing drivers with information during the race.
Here is a quick guide to the racing flags used:
The Green Flag Signifies the start or restart of racing conditions. NASCAR Officials will signify one lap to go, one lap before the green flag is displayed. Once the green flag is displayed on a start or restart, all vehicles must maintain their respective track position/lane until they have crossed the start/finish line.
The Yellow Flag / Caution Lights are used during a caution. All cars must slow down immediately to a pre-determined pace
The Red Flag denotes on-track activity must be stopped immediately regardless of the position of vehicles on the track. Vehicles will be brought to a stop in an area designated by NASCAR. Crews are prohibited from working on vehicles when the red flag is displayed. This includes refueling.
The Blue Flag is only used at road course events. A blue flag indicates a local track condition.
A Blue Flag with Diagonal Yellow Stripe means that faster traffic is overtaking the vehicle being signaled. Vehicles being given the blue flag with diagonal yellow stripe must prepare to yield to faster vehicles.
The dreaded Black Flag notifies selected drivers that they must drive immediately to pit road and report to their pit stall. Drivers receive the black flag for reasons including a driver/team infraction or potential problem with the car. The black flag does not signal automatic disqualification.
A Black Flag with Diagonal White Stripe follows the black flag if a driver has not obeyed the black flag. The black flag with diagonal white stripe signifies additional scoring of the vehicle will be discontinued until further notice.
The White Flag is thrown after the race leader has started the last lap in the race.
The coveted Checkered Flag signifies the race is completed.
Start / Restart Details:
All starts and restarts are signified by the green flag. At the initial start of the race, the number two starting position must not beat the number one starting position to the start/finish line. Once the green flag is displayed on a start or restart, all vehicles must maintain their respective track position/lane until they have crossed the start/finish line.
All restarts are made within a designated restart zone on the track that is communicated to drivers in the driver / crew chief meeting. The race leader will control the restart within the restart zone. If the leader does not restart by the time he/she reaches the exit (single red line) of the restart zone, the flag person will restart the race.