In the presented situation, are you obliged to signal the fact that you have parked a broken-down car on a road which is not an express road, if the car may be seen from a sufficient distance?

Why?

The car is on the shoulder and visible from a sufficient distance. On an ordinary road outside a built-up area, a broken-down vehicle stopped like this does not require breakdown warnings. On the shoulder, that requirement applies when the vehicle cannot be seen from far enough away.

art. 50 ust. 1 pkt 2 lit. a Prawa o ruchu drogowym