This is exactly what I was referring to in the other post. Mixed messages between three North American countries related to land travel. As I stated, we have the T-MEC agreement but it doesn't seem ...
Moisheh, the list of essential travelers is short, it doesn't cover transiting but apparently this happens. Americans have somehow been transiting across BC Canada to Alaska and back all this time, so there must be something to this effect in the rules - not on the list of essentials.