In this situation, are you required to change lanes?

In the video you are driving in the left lane of a street in town; lane-change arrows P-9 painted in your lane direct you into the right lane - your lane is about to end. You are required to change lanes. The answer is: yes.

The Regulation on road signs and signals states that marking P-9 "lane-change arrow" means an order to move into the neighbouring lane shown by the arrow; the only exception is drivers of vehicles for which the further section of the lane is intended. The Road Traffic Act requires you, when changing lanes, to exercise particular caution, signal your intention clearly and in good time with the indicator, and give way to vehicles travelling in the lane you are moving into. You change lanes smoothly and in good time, without waiting until the very end, adjusting your speed to the cars in the right lane.

Legal basis: § 87 para. 3 of the Regulation on road signs and signals; Art. 22 para. 1, 4 and 5 of the Road Traffic Act (Prawo o ruchu drogowym)