Final answer:
In low visibility conditions like fog or snow, use headlights on low-beam and, if available, use fog lights instead of high-beams to improve visibility and reduce glare.
Step-by-step explanation:
When driving in lower visibility conditions such as dense fog or snow, you should turn your headlights on low-beam to reduce the glaring reflection. Using fog lights are even better under these circumstances. Turning headlights to full-beam or high-beam can result in a glare that is dangerous and reduces visibility further. Fog lights are designed to provide better visibility in such weather conditions because they shine lower and have a wider beam than regular headlights, reducing the reflection off the fog or snow and improving your ability to see the road ahead.