A few people have mentioned that staying right except to pass is for highways only. I hope that they are including Deerfoot and Stoney in their definition of a highway, even though they are within the city limits. I understand that this doesn't work on a lot of roads with lots of lights and intersections as people have to turn left, there are lots of stops, etc. But Deerfoot and Stoney are clearly highways.
The reason why the left lane works as a passing lane is because all entering and exiting is done on the right. The right is where the merging, exiting, and crusing happens. The left lane is for passing. Having cars pass on the right (presumably because someone is using the left lane for something other than passing) is downright dangerous. Faster traffic meeting merging and/or slowing traffic = recipe for disaster. There's a reason why passing happens on the left and everything else happens on the right.
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