In this situation, are you warned of road narrowing that may impede traffic?

In the video, you are leaving a roundabout onto a road outside town, with barriers on both sides; on the right there are two yellow triangles: A-12a "road narrows - on both sides", and below it A-16 "pedestrian crossing" with plate T-1 "50 m". You are warned of a narrowing of the roadway which may impede traffic. The answer is: yes.

The Regulation on road signs and signals states that sign A-12a "road narrows - on both sides" warns of a narrowing of the roadway on both sides which may impede traffic; the second sign, A-16, warns of a pedestrian crossing, and plate T-1 below it shows that the crossing is 50 m further on. Two signs on one post are two separate warnings, and you must read both - here the roadway narrows and 50 m further on there is a crossing, so the space for pedestrians and for vehicles shrinks at the same time. Warning signs require you to exercise particular caution: you slow down before the narrowing, check whether there is room for you and an oncoming vehicle, and do not overtake, and at the same time you look out for pedestrians at the crossing - the Road Traffic Act requires you to reduce speed before a crossing and give way to a pedestrian who is on it or stepping onto it.

Legal basis: § 7 para. 3, § 8 para. 1 and § 3 para. 1 and 4 of the Regulation on road signs and signals; Art. 26 para. 1 of the Road Traffic Act (Prawo o ruchu drogowym)