In this scenario, could the vehicle travelling by the roadside pose a hazard?

Why?

The grey car is travelling along the shoulder beside your lane and could move into it. Its driver must give way when entering the carriageway from the shoulder, but you should watch its movements and be ready to slow down.

art. 17 ust. 1 pkt 3 i ust. 2 Prawa o ruchu drogowym