Making sounds

Making sounds!
“making sound (gerucht) is forbidden”

ge-rucht (het ~, ~en)

  1. gossip
  2. any prodced sound, something breaking the silence

What does this Dutch sign mean. It says access prohibited. Clearly you cannot pass over the empty field of grass. But to prohibit making sounds? Are you not allowed to talk about the field of grass, or does any sound effect the empty field? I don’t know what it means and what’s the problem with some sound. Any ideas?…