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The basic problem with concrete and asphalt paving is that it wears out from constant use. Other problems also contribute to the issue of wear; weather and light, to name but two. These cannot be fixed completely.
Compare that to a magnetic levitation rail. Their are no permanent magnets; only electrically-induced fields. There is no contact with the rail. The rail need only have a marine grade coating to keep it from rusting; relatively cheap and long-lasting.
The elevated rail has an indefinite lifespan. The current highway surface lasts maybe ten years, but shows signs of decay in the first year. We don't even require the guarantees which they do on the Autobahn in Europe. But even their's needs repair.
Regardless of the consideration, the rail always wins.
Maglev rails go in one direction just like the roads in the city. Railroads share directions on the same track; just asking for accidents and death, or very expensive options. Simply not worth it.
Pallet-type ride-on options for personal vehicles still are over-kill and complex for no actual benefits. I see no benefits.
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