Answer:
Legal use of hazard lights: if the car is in an accident or other wise disabled (unmoving) and located near a road (ie, the shoulder)
Illegal use of hazard lights: In heavy rain or any other time the vehicle is in actual motion.
Hazard lights are used to indicate and UNMOVING vehicle.
Legal Use of Hazard Lights: If the car is in an accident or not moving and you are pulled over near the road, you should use your hazard lights.
Illegal Use of Hazard Lights: When you use your hazard lights while your car is in motion, it is illegal to drive.
