Different flags used in NASCAR

Flags are one of the most efficient ways to quickly transmit messages to drivers racing at 200mph. NASCAR's no different than other motorsports and relies on eight flags to get the following important messages out while drivers are on course.
The Green Flag
The White Flag
The Checkered Flag
The Yellow Flag
The Black Flag
The Black Flag with White X or Diagonal Stripe
The Blue Flag with Orange or Yellow Diagonal Stripe
The Red Flag