In this situation, can you make a U-turn?

In the video you have stopped in the left lane with a left-turn arrow at a junction in town; the directional traffic lights S-3 by your lane show a combined green arrow - left and U-turn. In this situation you are allowed to make a U-turn. The answer is: yes.

The Regulation on road signs and signals states that the signals of directional traffic lights S-3 apply to drivers travelling in the directions shown by the arrows, and a green S-3 signal means that when travelling in the direction shown there is no collision with other road users. An arrow with its head bent downwards is the symbol of a U-turn; since it shows green together with the left arrow, both manoeuvres are allowed. You make the U-turn smoothly, with your left indicator on, checking whether your turning radius lets you fit on the roadway on the other side.

Legal basis: § 97 para. 1 and 3 of the Regulation on road signs and signals