I went for a glorious ride with my brother during holidays to visit the Canada-US border. The road runs on the edge of border and has the totem markers in the ditch. You can also see the border cut line running up the mountains in the distance:
The USA is about 3 yards to the right of the road, thus I imagine this location is used by smugglers moving Marry Jane to the other side. There are no guard stations or border crossing huts here, just pathways that lead into the bush every 100 yards or so. This is mostly farm land and civilization is a good 20km up the road and to the left.