Are you allowed to use the sound signal, in ths situation?

In the recording, you can see yourself driving a tram when a white delivery van pulls onto the tracks directly in front of your vehicle, creating a risk of collision. According to Art. 29 para. 1 and 2 of the Road Traffic Act, you have the right to use an audible signal because it is necessary to warn of immediate danger, which is an exception to the ban on using the horn in a built-up area.