In this situation, can you use the horn?

Why?

You are entering a residential zone, and a wheelchair user is crossing ahead of your car. You must stop and allow them to cross safely. The horn is for warning of danger, not for hurrying a pedestrian, so their presence alone does not justify sounding it.

art. 29 ust. 1 i art. 26 ust. 7 Prawa o ruchu drogowym