In this situation, should you signal your intention to change lanes with the right turn signal?

In the video you are driving in the left lane of a dual carriageway between noise barriers; on the right there is sign D-14 "end of lane", which shows that your left lane ends and the right lane continues. You must signal your intention to change lanes with the right indicator. The answer is: yes.

The Road Traffic Act requires a driver to signal an intention to change lanes with the indicator in good time and clearly, and to stop signalling immediately after completing the manoeuvre; when changing lanes, the driver gives way to a vehicle travelling in the lane they intend to enter. The end of a lane does not release you from signalling - on the contrary, drivers in the right lane must know when and which vehicle intends to move in front of them, especially when there are several. The Regulation on road signs and signals states that sign D-14 marks the end of the lane at the very edge of the roadway on the side shown on the sign, so you have time to prepare calmly: right indicator, mirror, blind spot, a smooth move across and switching off the indicator. In a traffic jam, the zipper merge (jazda na suwak) applies - you drive to the end of your lane, and the driver in the right lane lets you in ahead of them directly before the point where the lane ends.

Legal basis: Art. 22 para. 4, 4a and 5 of the Road Traffic Act (Prawo o ruchu drogowym); § 49 para. 5 of the Regulation on road signs and signals