Let us assume that you have one hole and three safety barriers. Your job is to set up those barriers so that people do not fall into the hole. Which of the following would you think is the best solution:
Now, I would suggest that a) is the best option, but let's see what the Cairns City Council's Esplanade work teams think:
It's too dark down there to see my footprint!
I only discovered the hole when I chased a plastic bag from my lunch as the wind took it, and I stepped off the paving into the hole. I've escaped with some sore muscles and a bit of a scratch to my legs, but I can imagine a far worse possible outcome.