When driving in a rainstorm and visibility is low, many drivers are quick to turn on a vehicle’s hazard lights. One reason for turning on the hazard lights is that the driver feels that it will help another driver to see his vehicle in the rain. Another reason is to alert other drivers that the reason he is driving slow is because of the rain. Although you may mean well by turning on your hazard lights in the rain, it is a practice that law enforcement officials claim will do more harm than good. Depending on the country you are driving in, you can receive a citation for breaking the hazardous lights protocol.
Refrain from turning on your hazard lights in the rain while your vehicle is still moving. In some countries, such as the United States, it is actually illegal to turn on your hazard lights while your vehicle is still moving.
The hazard lights could actually reduce visibility, making others think that a driver has stalled or making it difficult to know if the driver is applying the brakes or making a turn. Flashing hazard lights in the rain reduce the conspicuousness of the brake lights, making it difficult for other drivers to know when you are applying your brakes
If you must use your hazard lights, pull off of the road, highway or street that you are on and park your vehicle until you feel the rain has lightened up enough for you to get safely back on the road. When parking your vehicle, be sure that there is plenty of space between your parked vehicle and passing vehicles. Once properly parked, you may turn your hazard lights on (while your vehicle is parked on the side of the road) to ensure other drivers are able to see your vehicle. Before getting back on the road, be sure to turn off your hazard lights