What are the permitted driving directions according to the traffic signs in the following intersection?

- Straight and left for busses only.
- Straight in the direction of the arrow only for non-public vehicles.
- All vehicles approaching will continue in the direction of the arrow.
- Correct answer: Straight, for public transport only.
Why this is the answer
The correct answer in the official bank: Straight, for public transport only.
The signs and the arrow at the intersection allow driving straight for public transport only. So it is not true that all vehicles approaching will continue in the direction of the arrow, and there is no permission for buses to turn left. A vehicle that is not public transport may not continue straight at this intersection either.