When the sun goes down and it gets dark outside, the driver's ability to see the road becomes more challenging. Fortunately, all vehicles are equipped with car headlights to help illuminate the road ahead. Over time, like any light, they will start to dim or go out completely. Driving around with just one headlight can be dangerous to yourself and other drivers, and put you at risk for traffic violations.

　　If you find that only one headlight is out, instead of both, you can assume that only one of the bulbs burned out and needs to be replaced. However, if both headlights go out at the same time, while it may seem like a coincidence, this is uncommon and requires further inspection.

　　When both headlights go out at the same time, the most common cause is a power failure. Headlamp relays, modules, main switches, or fuses may be the cause of the failure. A technician will need to test the power of each headlamp to determine the exact cause of the repair.

　　Replace burnt bulbs as soon as possible. Driving with one or two headlights is not only dangerous, but it may also be illegal depending on your state's laws. Most states require that all vehicles except motorcycles have two functioning headlights, which must be used from dusk to dawn. If you are pulled over for turning off the lights without your knowledge, the officer may simply warn you and advise you to fix it right away. If you are violated, in many cases you only need to show proof of correction and pay a small fee to the court. If you keep driving without fixing your lights, your driving record could be in violation of traffic rules and you may have to go to court.

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