It is prohibited to drive too close to the vehicle in front of you:

1. During the dark only.
2. Only when the weight of the vehicle in front is more than 4 tons.
3. On a steep descent and only after a “dangerous descent” sign.
4. Correct answer: Because it might brake suddenly.

WhyDo not drive too close to the vehicle in front, because it may brake suddenly. Without enough distance you will not have time to stop.