The “Skytrain” system in Vancouver, BC, actually an elevated electric rail system with underground sections in the most densely built-up parts of the core, is entirely driverless. The only attendants are a sprinkling of transit cops who can police illegal activities, or verify that passengers have a paid fare receipt, etc. It’s the longest such system in the world, and is heavily used. It is reaching the conclusion of a major extension which will directly connect the downtown to the airport, with other extensions to satellite “bedroom suburbs” in the works. Cheap power would be a major boon to it.
Vancouver is also one of the few cities with a fairly extensive pool of electric trolley buses, serving mainly the downtown core and some nearby parts of the city. Those would also benefit greatly. If battery tech continues to advance, BEV buses would also be obvious options. Some neighborhoods are served by smaller “Community Buses”, with seating for perhaps 30 people, and there are smaller ones yet for on-call pickup of the disabled etc.
As for direct installation of an FF generator in a bus, I note that the TeslaMotors 2 & 7-seater sportscar and sedan will use battery packs weighing about ½ ton, so 4X that weight for a bus to have on-board power doesn’t seem excessive, though the volume and shielding might complicate things.
Transit has been strongly emphasized in making trade-off decisions, to the extent that major roads and bridges into the core areas have been discouraged in order to keep large residential populations in and near the core. Parking lots and garages are also kept to a minimum there. Public transit is essential to any such city planning, of course.
As it needs to be big enough to fit a fusion reactor in it instead of skycar think of the megawatt quadcopter as a flying bus. With low fuel and low infrastructure cost, low congestion and hig speed, these flying busses will become the main computing method for cities opening up ne more distant and previously inaccessible suburbs.