Let me introduce you to the modern world. If this guy somehow gets hurt while "exploring" this construction site, it becomes the contractors responsibility for not supplying adequate warnings and security for preventing it. In your world anyone should be able to walk around where ever, whenever they want. Oh, look at this giant 30 story crane, no one is here, I'm just exploring. You are a clown and anyone with common sense and an understanding of why society has developed safety procedures thinks you're a joke. Go climb the fence at a prison smart guy. Better yet walk into an airport with a bomb. Everyone here knows it's a joke. But you are special, so we understand.