When changing lanes on an unmarked roadway, are you exempt from signalling this manoeuvre with the appropriate turn signal?

Why?

A traffic lane can exist without painted markings, as on the street shown. You must signal your intention to change such a lane clearly and in good time using the appropriate indicator. The absence of lane markings does not remove this duty.

art. 2 pkt 7 oraz art. 22 ust. 5 Prawa o ruchu drogowym