I will add to what Brian posted above, and say that the border crossings INTO Canada have tightened up their rules regarding who is NOW allowable to enter Canada, and who is NOT allowed to enter Canada.
Directly from the mouth of one of the Canadian Border Agents:
"Due to Donald Trumps' tightening of the immigrations rules regarding who can, and cannot be allowed to enter the USA.....Canada has responded in kind.....therefore what WAS allowable, permissible, or overlooked in the past, will no longer be allowed, permissible, or overlooked."
And with that statement, every rider/passenger of the Three Flags Classic should take a moment and reflect back on their own personal history, and if there is anything that might possibly get you turned around at the border, do your best to clear that up now, even to the point of contacting one of the two Canadian Consulates.
Just because you were allowed to cross the border into Canada for the past 10, to 20, to 30 years....does NOT mean that you won't be turned around at the border now, under their tightening restrictions.