Hmmmm

this is a sign to not kill the microbacteria, found in the mystery flesh pit national park

Do not have yourself in a static pose when a rock is headed towards you

-the sign, probably

I think I got it! It's a sign to tell people not to walk on the corrugated metal sheet because they are fragile. How thoughtful of them to put this sign!

Seems like it

The sign is saying that you shouldn't stand on the icy and slippery roof shingles.