When approaching the stopping place for a school bus outside the built-up area, are you obliged to allow the driver of the bus to enter the roadway, if it signals the intention to perform such a manoeuvre?

Why?

An orange school bus is stopped on the right. If its driver signals an intention to enter the carriageway, you must slow down and, if necessary, stop to let it pull out. This duty also applies outside built-up areas.

art. 18a ust. 1 pkt 2 Prawa o ruchu drogowym