Can you sound the horn to warn others against imminent danger?

Why?

You may sound the horn to warn others of immediate danger, including in a built-up area. The photo shows the horn button on the steering wheel. You must not misuse the horn, for example to hurry another driver.

art. 29 ust. 1 i ust. 2 pkt 1 i 2 Prawa o ruchu drogowym