Apart from not being buried what you're describing sounds an awful lot like Personal Rapid Transit (PRT). WVU has been operating their PRT system since 1975.
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Sure. Developments in self driving and electric vehicles, ride hailing and general automation make PRT a much more convincing proposal today and a genuine public transport alternative to the personal car, which collective vehicles
with rigid routes will never be.
All while avoiding the seemingly insurmountable difficulties of fully autonomous driving on congested and chaotic city roads.