GREEN: Start...
Indicates the start of the event or a restart after a caution period.

BLUE/YELLOW STRIPE: Move over...
Indicates that a faster car is overtaking the car being siginaled and the car being signaled should be prepared to give consideration to the overtaking traffic.

YELLOW: Caution, slow and hold position...
Indicates an unsafe condition on the race track. Drivers are required to slow down and maintain their position. Cars may not pass under the yellow flag.

YELLOW/TWO VERTICAL RED SLASHES: Oil on track... Indicates unsafe surface condition.

BLACK: Pull into pits for consultation...
Indicates the car being signaled must go immediately to the pit area for consultation. The scoring of any car that ignores the black flag will be discontinued.

RED: Stop...
Indicates the complete stoppage of the race due to some unsafe condition.

WHITE: Entering last lap...
Indicates to the drivers that they have started their last lap.

CHECKERED: The race is finished...
Indicates the completion of the race.