When is it forbidden to overtake, or to try overtaking, another vehicle?

1. In a distance of 300 meters before a railway crossing.
2. Correct answer: When visibility is poor or when the field of vision is obstructed or limited.
3. During night time.
4. When driving uphill.

WhyIn poor visibility or with a limited field of vision, overtaking and even trying to overtake are forbidden. Night and uphill roads are not a ban in themselves, and the distance before a railway crossing is 100 m, not 300.