I think the biggest problem is driver education and enforcement- in Toronto the most dangerous thing you can do is cross on a green light when a car is about to make a right turn. Forget about red-light cameras- if a cop spent a day at the corner by my office he'd nail so many drivers who fail to yield he'd have to file a workers' comp claim for the writer's cramp.
Here in Houston, Metro bus drivers have been known to hit pedestrians who have the right of way.