* When it is too dark to see from 1,000 feet away.
* • Beginning 30 minutes after sunset. •
* Until 30 minutes before sunrise.
* • In adverse weather. If you need to use your windshield wipers due to fog, rain, or snow, you must turn on your low-beam headlights.
* When conditions (such as clouds, dust, smoke, or fog) prevent you from seeing other vehicles. •
* On mountain roads and tunnels (even on sunny days). •
* When a road sign states that headlights must be on. •
* To help other drivers see your vehicle, especially when the sun is low on the horizon.