Crashnet > Guide Index > 2. Flags & Signals

	Green flag: start/restart race, shown at start line only. At the start of a race, this may be preceeded by a rolling lap, for which the yellow flag is shown to indicate that the rolling lap has begun.
	Red flag: Stop race or race ended. Shown around track by marshals. This flag may be requested by the steward or the start marshall when it is impossible to safely continue the race, or may be requested by any official if a driver is in danger.
	Red and chequered flag together: sometimes used to denote end of race. Shown at start/finish line only.
	Chequered flag: Race winner is or has passed finish line (race has not concluded and should continue until further red flag deployed). Shown at start/finish line only.
	Yellow flag: Warning to drivers of danger or wreck on track. Shown locally to incident by marshals. This may be replaced by a waved yellow or red flag if the wreckage contitutes a hazard to involved or other drivers.
	Waved yellow flag: Used to denote dangerous condition on track, drivers to slow down and drop into single file until green flag shown. Repeated around course. May be replaced by a red flag if the hazard cannot be safely cleared.
	Blue flag: shown in non-contact racing to denote that faster driver on preceding lap is approaching you. Hold line until passed. Shown at start/finish line only.
	National flag: Used to denote half way through race. Approximation only. Shown at start/finish line. This signal may also be given in some formulas to denote a change of racing, for example where the degree of contact changes (as is the case in Bangerods at TSR, for example).
	White/crossed black flag: Denotes that driver has contravened contact or starting regulations and is being warned. May result in penalties after race. Shown at start/finish line.
	Black flag: Driver to retire from race; disqualification. Shown either at start/finish line or by clerk of course. This is usually because the driver has contravened racing regulation.
	Black crossed white board: Denotes that driver has contravened contact or starting regulations and is being warned. May result in penalties after race. Shown either at start/finish line or by clerk of course.
	Blue circle white board: Warning to drivers; oil hazard on track. May be accompanied by indication of position of hazard. Shown on track prior to starting.
	Four/three/two/last lap boards: Denotes number of laps to go at end of race. Shown at start/finish line. Where predefined warm up laps used (for example National Hot Rods/2 litre Hot Rods/PRI Hot Rods) boards also used to denote number of warm up laps to be used.