Why the unusual exit signal at Bedzin?

[NeatKefe]

To set exit signal, e.g. E2, I must first set D when exiting towards Dąbrowa Górnicza. In the notes for the station it says this is “a safety aspect”. What safety aspect would that be? I’m struggling to understand the purpose of signal D, and I haven’t seen this setup anywhere else. Are there more examples out there..?

[Shiralyn]

Łódź Chojny has a similar exit but this is due to a crossing, I'm also interested in the answer.