Following a similar generation logic as river biomes, but a road with a more consistent width instead. Ideally connecting two to three (or more) villages. Would be a neat place to have smaller structures spawn along it’s length too. It’s utility as a road for travel is clear but also there’s something rather romantic about following a road, IMO. The idea that the road leads somewhere. The idea that you can build something along this road and know it connects to something else.
On multiplayer servers I imagine you might see bases naturally clustering along them, plus provides an easy avenue for new players to travel out of spawn areas.
I love this or even the idea of the rivers as “roads” and having little fishing huts, abandoned small farms, a tiny shack with a crafting table inside, etc along riverways would be awesome. It would make traveling by boat much more interesting and make me want to explore waterways if there were potential signs of life out there