If using intermediate or wet tyres on a dry circuit, what is a competitor required to do?

When using intermediate or wet tyres on a dry circuit, a competitor is required to turn on their rain lights. This serves as an important safety measure. Rain lights are used to indicate to other drivers that a car is on wet weather tires, which may affect its grip and handling characteristics compared to those on slicks. This additional visibility helps maintain safety on the track, especially if conditions are unexpectedly variable.

Turning on the rain lights alerts other competitors and officials that the car may be operating under different conditions than the rest of the field. This ensures that other drivers exercise caution when approaching, as the car may be slower due to the different tires.