4. Do NOT turn on your hazard lights. Again, contrary to popular beliefs, turning the hazard lights during a heavy downpour is NOT helpful at all, but downright stupid. This is a case of 'monkey-see-monkey-do' when other drivers turn on their hazard lights just because the vehicle in front of them does. As mentioned, bright lights can cause glare and limit your vision, as well as the vision of drivers of adjacent cars. The flashing lights are also very distracting and should only be used when you're in an emergency or when your vehicle becomes a road hazard. That's why they're called hazard lights. They're supposed to be used to warn other drivers that your vehicle has become a hazard and not to warn them of the hazardous weather conditions. Anyway, they can tell the weather just by looking around, thank you very much. And lastly, when you use your hazard lights other cars won't know when you want to change lanes.
Everytime it rains hard, its impossible not to notice that most vehicles turns their hazzards on and before you know it you are left predicting will they change lanes or not..