When is it necessary to turn on your headlights?

Answer: B — In low visibility conditions or at night

Turning on your headlights is essential in low visibility conditions or at night to ensure both your visibility and the visibility of your vehicle to others. In situations where natural light is insufficient—such as during twilight, heavy rain, fog, or when driving through tunnels—headlights enhance your ability to see the road ahead and any potential hazards. Additionally, using headlights during these conditions helps other drivers and pedestrians notice your vehicle, significantly increasing safety on the road. While headlights can be useful in heavy traffic situations for visibility, they are not specifically required unless visibility is compromised. Daytime driving typically doesn't necessitate headlights unless conditions like severe weather arise. Overtaking another vehicle does not require headlights unless low visibility is present; however, using high beams or headlights might be appropriate to signal your presence, depending on the situation. Thus, the key rule is that headlights must be used where visibility is typically low or at nighttime to maintain safety on the road.