Yes, these had to be Trikkes. I'd never seen them before today and didn't know such a thing existed. They do seem to take up a lot of space, but these two folks must have known what they were doing, since they didn't take up more than their side of the trail, and they stayed in single file so that was nice.

I have no idea how they'd do at climbing, but they don't look like the sort of thing you'd want to take out on the road. But, who knows?