In the visible situation, are obliged to quickly return to the right side of the roadway?

In the photo you are driving along a road outside a town, where the left lane in your direction - used so far for overtaking - is just ending; lane-change arrows P-9 pointing right are painted on the roadway, and further on there is only one lane in your direction. You must return to the right side of the roadway as quickly as possible. The answer is: yes.

The Road Traffic Act requires the driver to keep as close as possible to the right edge of the roadway, and 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 for whom the further section of the lane is intended. Beyond the end of the extra lane, the left part of the roadway becomes a lane for vehicles coming from the opposite direction - anyone who stays on it too long is driving head-on towards others. So you move right as soon as you see the arrows, with your right indicator on, giving way to vehicles in the right lane, and you do not start a new overtaking manoeuvre that you will not be able to finish before the narrowing.

Legal basis: Art. 16 para. 1 and 4 and Art. 22 para. 4 of the Road Traffic Act (Prawo o ruchu drogowym); § 87 para. 3 of the Regulation on road signs and signals