Near Stanstead, Quebec and Derby Line, Vermont, Rue Canusa is formed by the combination of Canada and USA. Different from 0th Avenue in Surrey, the surveyors played a trick by splitting the border right down the middle of the road. The eastbound lane is in Canada while the westbound lane is in the US.
The two ends of the road are only connected to the Canadian road network. Drivers need to cross a border checkpoint to turn off to American roads. The houses on one side sport American flags and have Vermont-plated cars on the driveway, the other side of the road has Canadian businesses and residences.
Drivers in Canada can drive on the westbound lane as long as they don’t stop. A sidewalk is only available on the Canadian side of the road. American residents need to exit US customs to go home and re-enter it to pop to the shops, which has become a hassle since the pandemic. Technically, they can sneak into Canada without declaring themselves to Canadian customs, but the RCMP catches up pretty quickly.
It’s not only the only place in the long Canada-US border to be split by a roadway, it is also the only place along the border where you can stand directly between the two countries’ checkpoints without being processed by either of them.