Why to have a GOOD headlight on in your car?

Your headlights are an essential safety system for nighttime driving & visibility. If your headlights are not working, or are not aimed properly, you might not be able to see the road clearly.
Whenever visibility is poor or it rains, headlights are a good way to let other drivers know where you are. It's both helpful to other travelers and makes you more safe. Remember, you are not the only one affected by poor visibility. You may be able to see cars without their headlights on but others may not have vision or windshield wipers as good as yours. Many states require headlights to be turned on when it is raining or when visibility is reduced to less than 500 feet.