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Westbound Roblin (50 kmh) onto northbound William Clement Parkway (80 kmh) has a sufficiently long merge that extends all the way from Roblin up to the bridge (325 m long)... not that most people know what to do with it. For reasons that escape me, most prefer to stop at the yield and wait for oncoming traffic to clear so they can cross all lanes of traffic immediately to get into the median lane. I see that one every day on my commute.

Of course, EB Portage onto SB Route 90 is an example of a ridiculous short merge - no doubt a function of the cost to add an extra lane to the bridge.