On one of our crossings eastbound towards Dawson City, as we approached the border crossing a motorhome was stopped in the middle of the highway westbound. There wasn't any room for us to go by him. He was sitting in the driver's seat, we thought he'd get moving as we approached. Nope. We stopped, got out, waved at him, knocked on the MH door, waved again, honked horn...no response. He sat staring forward, not acknowledging our presence in any way. So I checked the highway shoulder and the ditch, and we towed the fifth wheel down into the ditch and around the motorhome so we could continue our journey.
He had driven the easy part of the highway, still had the narrow, windy part to go. Don't know how he managed. Don't know why he didn't pull into the Davis Dome Wayside to take a break, he was just a short distance past it.