the lemur
Senior Member
The one exception could be Moscow where there are hundreds of underground pedestrian crossings. Underpasses there are like little malls, with kiosks and vendors, plus provide some shelter from the elements. Moscow's intersections look ridiculous, as well, which probably has something to do with it.
Since most of what one assumes Toronto's busiest pedestrian intersections are already overlapped by PATH the need for a second, elevated, pedestrian crossing is a bit redundant.
There's quite a few underground crossings in London (marked 'subway'!), mostly where the road is too wide and/or busy to be crossed safely at grade.