Tip: Headlights deteriorate with age and when they fall out of alignment, can blind other drivers and reduce your ability to see the road. For optimum safety, adjust headlights every twelve months. Tip: If there is any doubt, turn your headlights on as soon as the sun begins to set. Lights will not help you see better in early twilight, but they make it easier for other drivers to see you. Being seen is as important as seeing.