[hipster duck]

^The thing is that the people from those southern states who visit Niagara Falls, Ontario obviously have a passport. What's interesting is that once they come over, they seemingly just cross back over again. It's as if they're on a cross-USA trip and the only reason they brought their passport was to see the Falls from the Canadian side.

I don't even see those plates on the QEW between Hamilton and Niagara, which is a route some Americans take if they're going from Michigan to Upstate NY. The trip through Ohio is a bit of a detour and is also tolled.