I think there's also a misunderstanding of how these tunnels "work" in practice.
The ones in Montreal (and Kobe, Toronto, etc) don't seem to replace surface streets or transit; they complement it. The Réso in Montreal overlaps with some of the most walkable parts of the city and a half-dozen metro stops, plus train stations and bus depots.
I also don't think many people "thru-hike" it either. A lot of it is short trips (e.g., grabbing lunch) that would be doable, but a bit more annoying, if you had to re-dress for the weather on each end.
The ones in Montreal (and Kobe, Toronto, etc) don't seem to replace surface streets or transit; they complement it. The Réso in Montreal overlaps with some of the most walkable parts of the city and a half-dozen metro stops, plus train stations and bus depots.
I also don't think many people "thru-hike" it either. A lot of it is short trips (e.g., grabbing lunch) that would be doable, but a bit more annoying, if you had to re-dress for the weather on each end.