I don't think I communicated that very well. The cars still ride on the wheels. The road is only used for propulsion (3 phase coils in road). A coil in the car could be polarized selectively to 'attach' to the road phasing (coils would be spaced to the established speed of the highway at the frequency of the grid). An aluminum (non-ferrous) coil would be ideal, so that when not in use, there's little induction.

The wheels are used to charge the battery when necessary (see Rivian's "tow charging"). There's probably an article in Popular Mechanics or something in the last 80 years. If I can think of it, someone else probably has, too. I'm not the person who comes up with these schemes. I'm the one that schemers come to if they can't get it to work.

Another alternative is an industrial tow truck system (one big battery driving back and forth on the highway) that travels the road and cars simply use a magnetic docking mechanism to form trains behind it. Smart systems combined with auto-driving cars would attach and detach automatically, synchronized according to destination. The tow motor/trucks would 'pile on' to go up and down mountains, with shared power coils in the road only on the hills.

I know; it's an elaborate scheme to accommodate the perception that passenger and auto carrier trains are obsolete in the USA, or that people actually need to drive as much as they do.

A better alternative is to just get rid of consumerism as the suicidal species-wide culture that it is and retrain people to stay home and care for their places and commons.