Are you allowed to make a U-turn immediately beyond the informatory sign in this situation?

The information sign D-3 "One-way street", visible below the speed limit sign, indicates that traffic on this road flows in one direction only. Making a U-turn on a one-way street is strictly forbidden because it would lead to driving against the flow of traffic and create a huge hazard. This prohibition stems directly from the provisions of Art. 22 para. 6 of the Road Traffic Act.