Are you allowed in this situation to change lanes in order to go straight?

Why?

A solid line and a hatched area closed to traffic separate you from the lanes continuing straight ahead. You must not cross the line or drive over the hatched area to change lanes. At this point, you must continue along the exit.

§ 90 ust. 5 rozporządzenia w sprawie znaków i sygnałów drogowych, znak P-21