Are you allowed to make a U-turn in this situation?

You are driving in a lane with a left-turn arrow and approaching a junction with a traffic island. Before it, on the left side, there is sign B-23 "no U-turn" - a red circle with a crossed-out U-turn arrow. The ban applies up to and including the nearest junction, so it covers exactly this junction. So you are not allowed to make a U-turn here.

The Regulation on road signs and signals says that sign B-23 prohibits drivers from making a U-turn up to and including the nearest junction. The left-turn arrow in your lane would on its own allow a U-turn, but sign B-23 cancels this privilege. In addition, on the island there is sign A-7 "give way" with a blue mandatory direction sign, and on the other side you can see B-2 "no entry" and D-3 "one-way road" - the road opposite is one-way, so making a U-turn into it would mean driving against the traffic.

Legal basis: § 22 para. 5 and § 87 para. 2 of the Regulation on road signs and signals