Does this sign indicate the start or continuation of a road with priority?

In the photo, in winter, you are driving along a street in a town; on the right there is a yellow square on a white background, placed on its corner - sign D-1 "priority road". This sign marks the beginning or continuation of a priority road. The answer is: yes.

The Regulation on road signs and signals states that sign D-1 "priority road" marks the beginning or continuation of a priority road, and plate T-6a or T-6b placed below it shows, respectively, the actual layout of the priority road through the junction or the layout of the minor roads. The sign is placed at the beginning of such a road and repeated before the following junctions, so that the driver always knows that he is on the main road; at the entries from side roads there are then signs A-7 or B-20. The end of the priority road is marked by sign D-2. Right of way from D-1 applies only to vehicles from minor roads - if traffic lights are working at the junction or a police officer is directing traffic, they take precedence over the sign, and you always exercise particular caution when approaching a junction.

Legal basis: § 43 para. 1 and 2 of the Regulation on road signs and signals; Art. 5 para. 2 and 3 and Art. 25 para. 1 of the Road Traffic Act (Prawo o ruchu drogowym)