What safety measure is crucial when driving in foggy conditions?

When driving in foggy conditions, reducing speed and using low beams is crucial for safety. Fog significantly decreases visibility, making it difficult to see the road and other vehicles. By reducing speed, drivers can have more time to react to unexpected situations, such as sudden stops or obstacles.

Using low beams is important because high beams can reflect off the fog, creating a glare that can further impair visibility. Low beams, on the other hand, provide a better illumination of the road immediately in front of the vehicle without causing excessive reflection, allowing for safer navigation through foggy areas.

Each of the other choices fails to address the needs presented by fog. Driving with high beams can actually worsen vision in foggy conditions due to the way light scatters. Solely relying on fog lights can leave parts of the road poorly illuminated, and staying in the left lane does not necessarily contribute to safety if the driver is not also managing speed or visibility correctly.