I came up with this conclusion...
Vancouver drivers are crazy, tend to tailgate and as you said take risks.
Edmonton drivers are arses, quite aggressive and discourteous.
I live in Edmonton (but spent some time in Vancouver) and have to agree!
In edmonton, I could count the number of drivers on my 2 hands over the past 7 years who have waved a hand to say "thank you" for letting them in the lane im in, in busy traffic.