I am confused, once again.

I don't know if you were following me a year and a half ago, but I posted a picture of this sign on a blog post then. If you haven't read that post or aren't inclined to do that now, the speed bump in this parking lot was taken out over the winter so that the road could be plowed.   But what do you know? They never did put the speed bump back in during the summer months.
 But, believe it or not, they did install a new speed bump sign. Can anyone out there tell me what is going on? Do they think that if they hide a bright shiny sign in the tree that we will actually slow down for a bump that doesn't exist?
I was just wondering if anyone can explain this to me.