You plan to go straight through the junction. Are you required to yield to a vehicle that may be approaching from the right?

Before the junction there is sign D-1 "priority road" with plate T-6a. The thick line on the plate runs from your side and turns right - that is where the priority road goes. Going straight on means leaving the priority road and entering a minor road. A vehicle approaching from the right is driving on the priority road, so you must give way to it.

Plate T-6a under sign D-1 shows the actual route of the priority road through the junction. Whoever leaves the priority road loses their privilege over vehicles that continue along it. The vehicle from the right is driving on the priority road, so you give way to it because of the signs, not because of the right-hand rule. At such junctions it is easy to make a mistake, because "I am going straight on" is intuitively associated with right of way - so always read the plate under the sign.

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