It is prohibited to overtake on a steep hill:

1. Only when there is a “danger” road sign.
2. Correct answer: When your field of vision is limited or obstructed.
3. Only when there is a “no overtaking” road sign.
4. Overtaking is permitted, provided that the weight of your car exceeds 4 tons.

WhyOn a steep hill overtaking is forbidden when your field of vision is limited or blocked. You cannot see who is coming over the crest.