Why is it important to turn on rain lights when using intermediate or wet tyres?

Turning on rain lights while using intermediate or wet tyres is crucial primarily because it enhances visibility during adverse weather conditions, such as rain or fog. When the track is wet, the likelihood of reduced visibility due to spray from other cars increases significantly. By activating the rain lights, a driver makes their vehicle more conspicuous to other competitors on the track. This is essential for maintaining safety for all drivers, as it helps prevent potential collisions and ensures that drivers are aware of the positions and movements of others in slippery conditions.

While signaling for help, indicating a tire change, or alerting other cars to hazardous conditions might be relevant in specific situations, the primary function of rain lights is centered around improving visibility during poor weather. This measure supports a safer racing environment, following the practice and regulations established by Motorsport governing bodies.