Ignoring that my country doesn't allow Idaho Stops, or that my Provincial Government wants to actively kill cyclists by removing safe cycling infrastructure, I've always wondered if there's a reason why cyclists aren't allowed to simply ride through an intersection like the one in the photo.
I'm talking about the right side, where the bike lane could extend through the intersection without interfering with other vehicles, including those that are turning left.
This would not only keep those stops safer (clears the cyclist out of the intersection), but would just make sense from a transportation efficiency standpoint.
Is there something I'm missing, or do cyclists have to stop only because motorists would take a tantrum if they weren't required to?
Motorists would make a tantrum regardless, and they don't stop too! Rolling through is very common; indeed expected in many areas. After all, how is a town supposed to enforce all of their intersections? For example, San Francisco has 18,525 intersections and 2,140 officers. Assigning 10 intersections per officer and to ignore all other police needs would be insanity. They're trying their best but it's an uphill battle.