I mean just building Rails in general would be a option…

Shure its impractical to put it over the road, but the amount of money, time and resources necessary to build such a thing below the surface is way higher and impractical as well.

Maybe tram rails would be the best idea, they can drive without driver already and there is no problem in transporting both People and goods with it. And the truck drivers might need a new job, so even if not automatic the thing would be more efficient.