When driving on a two-way road and visibility is poor:

1. You should horn while overtaking to warn the overtaken vehicle.
2. It is permitted to overtake, unless a “no overtaking” sign is placed.
3. You should turn on the parking lights while overtaking.
4. Correct answer: It is forbidden to overtake.

WhyOn a two-way road in poor visibility overtaking is forbidden. If you cannot see oncoming traffic, you do not overtake.