If you intend to turn left at the nearest junction, do you have to signal this manoeuvre with a turn signal?

In the video, you are driving along a street in a housing estate in a town and approaching a junction; on the right there is sign D-1 "priority road" with plate T-6a, on which the thick line turns left, and at the entry of the intersecting road there is the blue sign D-40 "residential area". When you intend to turn left at the nearest junction, you must signal this manoeuvre with your indicator. The answer is: yes.

The Road Traffic Act requires the driver to signal in good time and clearly the intention to change direction or lane, and to stop signalling immediately after completing the manoeuvre. A left turn at a junction is a change of direction - also when plate T-6a shows that the priority road itself turns left and you continue along it. The indicator is there so that others know what you intend to do: the oncoming driver and pedestrians on the estate will not guess whether you are going straight on or turning. Before the turn you move towards the centre of the roadway, switch on your left indicator early enough for the driver behind you to understand why you are slowing down, and, even though you have right of way, you watch the entry opposite; when turning into the intersecting road, you give way to pedestrians crossing the roadway you are entering.

Legal basis: Art. 22 para. 2 point 2 and para. 5 and Art. 26 para. 2 of the Road Traffic Act (Prawo o ruchu drogowym); § 43 para. 1 and 2 of the Regulation on road signs and signals