Are you allowed in this situation to drive straight on from the lane you are using?

Why?

The yellow arrow in your lane permits only a left turn. It takes precedence over the white straight-ahead arrow because yellow markings apply when the two colours give conflicting instructions. You therefore cannot continue straight ahead from this lane.

§ 85 ust. 3 i § 87 ust. 1 rozporządzenia w sprawie znaków i sygnałów drogowych