In NASCAR, a green flag means go. The flag is used to start the field at the beginning of a race. The green flag will not be waved again until the end of a caution period. At this time, the green flag is waved to restart the race.
The yellow flag is also known as the caution flag. The yellow flag indicates that the drivers must slow down and proceed around the track with caution. During a caution, the pace car will come on to the track and lead the cars until the race is ready to be restarted.
On all NASCAR tracks, the white flag is used to indicate to the drivers that they have started their final lap of the race. Only during road course events is the white flag used by the corner workers to indicate that an emergency vehicle is on the racetrack.
The checkered flag contains alternating black and white squares. When the checkered flag waves, it signifies the end of the race. The first driver to cross the finish line while the checkered flag is waving is the winner of that race.
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