1) The 2 outer ones may be in use. Forcing your way into one of these is asking for a bunch of fives.
Thats fine. Take the middle. The rules state it should be the outer one first, then the other outer one, then the middle (or toilet if you're shy).
2) I don't know about Canadian ones, but British toilets often have a low-placed urinal at one end for the use of children, so the prospective urinator has only a practical choice of 2 urinals.
Not here.
3) Again, possibly a British habit, but some people seem to regard urinals as alternative ash trays. I prefer not to be staring at a mess of disintegrating dog ends.
Never seen that here either.
4) The quality of the graffiti. Those above the middle urinal could well be of a superior quality.
I thought I was the only one that walked around reading the graffiti...