Slippery track, due to oil, water or loose debris. This board is always accompanied by a single waving yellow flag. VSC (Virtual Safety Car) is for more minor incidents, where no safety car is on track, but drivers must slow down to a required Delta. Drivers stay behind the SC until the marshals have cleared up. Safety Car is put out on track when an incident blocks the track or leaves a lot of debris. A specific speed reduction is added in order to increase drivers’ lap time to around 35% less than a normal dry lap time. Double waved yellow flag means overtaking prohibited due to danger on the track.Single waved yellow flag means overtaking prohibited due to danger off the track.

The meaning can vary depending on the way it is waved and how many are waved. While technological advances has meant that, in Formula One, many flags have been replaced by signal lights, the system of coloured flags has remained constant since the early years of racing. All forms of motorsport use a system of flags or signal lights to inform drivers of hazards during a session.

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