It's not actually as common on proper roads in Calgary as I first thought after looking - but yes that University Drive exit is one, Bow Trail - 10th Ave is another as well as Memorial - Crowchild. Having to merge into the left lanes on Deerfoot/Glenmore and Deerfoot/BBT also has the same effect, and you also have the lanes entering from the left on Crow/Bow. And of course Crowchild and other roads abruptly turn from freeways into roads with signals where you have to use the left lane to turn.
This means that at some point on many roads, people will have to move into a lane that isn't the rightmost, and I think many just pick their lane from the beginning and stick to it. Some are just oblivious though, like all the middle laners heading north on Crowchild NW.
There's also no actual freeways/motorways/autobahns, whatever you want to call them here, we just have big roads. In other countries these are legally different roads with different rules, and it is signed when you are on one (in the UK all motorway signs are blue). I'd like to see this in Alberta, although very few of our roads would actually meet any normal standard of freeway.
Australian freeway starts:
UK motorway ends:
It might be a little easier to educate/enforce rules if people had rules to follow.