Cartek realised that the full potential of Rain Lights was never being used. Instead of just being used for wet races the Rain Light could also be used as a hazard warning device. 
Our Rain Lights can help prevent rear-end shunts by alerting drivers of a stationary or slow moving car.
 
When to use it:
OFF - Clear track. 
ON - Wet race, poor visibility. 
HAZARD - Stalled on the grid. 
HAZARD - Driving slowly with misfire. 
HAZARD - Driving slowly with puncture. 
HAZARD - Safety Car or Red Flags spotted.