I don't really expect vents and grates to give way and send me plummeting into the sewer, but I still avoid walking on them. I'm not sure why. Maybe it stems from seeing cows with their legs stuck in cattle crossing grates when I was a little kid.
This picture was taken in Calgary, Canada, by a girl whose blog I read. This is one grate I wouldn't mind walking on. I think they should all be like this. And so, I will now be sending a petition around to all of you that we will forward on to the President's office. That should get results.