Which of the following actions should you perform when driving a passenger car at night in a fog?
Show the correct answer
Correct answer
A. Decrease the speed.
Explanation
When driving a passenger car at night in fog, you reduce your speed - answer A. Main beam headlights (B) make visibility worse in fog, because their strong beam reflects off the water droplets and creates a white wall in front of the car, and driving right behind the vehicle in front (C) leaves no room for braking.
The Road Traffic Act requires you, in conditions of reduced visibility, to exercise particular caution, to switch on dipped headlights or front fog lights or both at the same time, and outside a built-up area to give short signals with the horn when overtaking or passing a stationary vehicle or obstacle. You choose a speed that lets you stop within the distance you can see - in fog this is often a few dozen metres. You increase the following distance from the vehicle in front, because its lights do not tell you what is in front of it.
Legal basis: Art. 30 para. 1 point 1 and Art. 19 para. 1 of the Road Traffic Act (Prawo o ruchu drogowym)