What should a driver do in foggy conditions?

Answer: B — Use low beam headlights

In foggy conditions, using low beam headlights is crucial for maintaining visibility and safety. High beam headlights can actually worsen visibility in fog because the light reflects off the moisture in the air, creating a glare that makes it difficult to see. Low beam headlights, on the other hand, aim light closer to the ground and are less likely to reflect back into the driver’s eyes. This helps the driver see the road better and enables other drivers to spot the vehicle as well. Driving at the speed limit in fog is not advisable, as reduced visibility often requires adjusting speed to ensure safety. Similarly, while signaling turns is always important for safe driving, it does not specifically address the unique challenges posed by fog. Hence, using low beam headlights is the correct and most effective choice for driving safely in foggy weather.