In the presented situation, are you obliged to yield the right of way to the vehicle in the roundabout?

In the photo you are approaching a roundabout; before it on the right there are signs A-7 "give way" and C-12 "roundabout" and a pedestrian crossing, and a lorry with a semi-trailer is driving around the roundabout from the left. You are obliged to give way to vehicles that are on the roundabout. The answer is: yes.

The Regulation on road signs and signals states that sign C-12 means that at the junction traffic moves around an island in the direction shown on the sign, and sign C-12 together with sign A-7 means that a driver who is already within the junction has right of way over a driver entering the junction. At such a roundabout the right-hand rule does not apply - what decides is who is already on the roundabout. So the lorry driving around the roundabout has right of way, and you wait before the entry, stopping before the give-way line (linia warunkowego zatrzymania) if necessary. Giving way means that you must not force the lorry driver to brake or change their path; a long vehicle combination cuts the curve, so you do not squeeze in front of it. You enter when a gap appears in the traffic on the roundabout that lets you join without making anyone's journey difficult.

Legal basis: § 36 para. 1 and 2 and § 5 para. 5 of the Regulation on road signs and signals; Art. 2 point 23 of the Road Traffic Act (Prawo o ruchu drogowym)