Are you allowed in the presented situation to make a U-turn at the intersection?

In the video you are driving in the left lane of a wide street in town behind a white coach and approaching a junction; directional traffic lights S-3 at the left edge and a second set above your lane show a green arrow to the left, and the green light S-1 above the right lanes applies only to those going straight on. You are not allowed to make a U-turn at this junction - the directional traffic lights allow only a left turn. The answer is: no.

The Regulation on road signs and signals states that signals given by directional traffic lights S-3 apply to drivers travelling in the directions shown by the arrow, and a lane direction arrow allowing a left turn, placed in the far left lane, also means permission to make a U-turn, unless this is prohibited by sign B-23 or traffic is controlled by traffic lights S-3. When traffic in the left-turn lane is controlled by S-3, you may make a U-turn only when a separate U-turn arrow is lit on the traffic lights - a left arrow alone is not enough. This is because the signal programme provides only for the left-turn movement, and a car making a U-turn would be in the path of vehicles from another entry. You turn left, and if you need to go back, you make a U-turn at the next junction.

Legal basis: § 97 para. 1 and § 87 para. 2 of the Regulation on road signs and signals