How can the danger of driving a vehicle in heavy fog be minimised?

In the photo there is a road through a forest in thick fog; visibility is a few dozen metres, and the centre line disappears into the white. You minimise the danger by increasing the distance from the vehicle in front - the answer is B.

The Road Traffic Act requires a driver to exercise particular caution when driving in reduced visibility caused by fog, precipitation or other reasons, and also to switch on dipped headlights or front fog lights, and outside a built-up area in fog to give short sound signals with the horn when overtaking or passing a stationary vehicle or obstacle; you must also always drive at a speed that allows you to keep control of the vehicle, taking into account how far you can see along the road. In fog you can see only as far as your headlights light the road, so you must drive slowly enough to stop within the distance you can see, and far enough from the car in front so that its sudden braking does not catch you too close. Answer A, increasing speed, makes the braking distance longer with the same visibility - this is a direct route to a rear-end collision. Answer C, reducing the distance, is tempting because you can then see the lights of the vehicle in front, but it takes away time to react. When visibility is less than 50 m, you may also switch on the rear fog light.

Legal basis: Art. 30 para. 1 and 3 and Art. 19 para. 1 and para. 2 point 3 of the Road Traffic Act (Prawo o ruchu drogowym)