When should The headlights must be turned on?

Headlights must be turned on during low visibility conditions, such as at night, in fog, rain, or snow, when it is difficult to see other vehicles or road signs. They should also be used when driving through tunnels or on shaded roads. Additionally, it's advisable to turn on headlights during the day in adverse weather conditions to enhance visibility to other drivers. Always follow local traffic laws regarding headlight use.