The red flag is shown to the drivers when it is necessary for the race to come to a complete stop. Reasons for waving this flag may include a bad accident blocking the track, rain or other unsafe conditions on the track.
When the black flag is waved at a driver, that driver must then pull into the pits because of either a problem with the car making it unsafe to the driver(s) or another infraction, such as rough driving.
Black Flag with a White `X`
The black flag with a white ´X´ on it is shown if a driver does not pit within five laps of receiving the black flag. The flag means NASCAR officials are no longer scoring the driver until they obey the previous black flag and pit.
Blue Flag with Diagonal Orange Stripe
The blue flag with an orange diagonal stripe is shown to let the slower driver(s) know that one or more faster drivers are about to lap them. This flag is optional, and the driver may choose to ignore it if he/she wishes. Even though this flag is optional, NASCAR prefers that the slower driver move aside so that the leading drivers may still race.
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