I don't see how a magnetic field alone could work. You'd have resistance to movement which would generate some current, yes, but offset by said resistance.
You need to have power from some agency.
I suppose it could work going downhill, but you have regen braking for that.
Well the power, which creates the movement in the first place, is created by the car's motors. And the other power is created when you magnetize the road. Obviously that doesn't just occur naturally.
I'm not 100% sure whether the car moving through a magnetic field will actually create an actual force resisting the car's movement. That goes back to HS physics, and I'm old lol.
BTW there's another option, although I don't know how well it will work... 94 refers to essentially the magnets being laid flat. That's how hard drives worked before ~2005. Each bit was basically a bar magnet with its north and south pole laid flat across the surface. Ever since, it's been done perpendicular to the surface of the disk and thus the north and south pole are vertical--so there's only one exposed at a time to a reader.
What if the receiving coil is placed vertically instead of horizontally, and the road is magnetized in the same manner, perpendicular to the road surface. The way current is generated in the coil is not by the presence of a field, it's caused by a change in the magnetic field. So we were talking earlier about the change in magnetic field being caused perhaps by the cars moving through it horizontally.
In this case, if you could alternate the vertical magnetization of the road surface you could actually cause an alternating magnetic field in the receiving coil, generating power. Say it's calibrated for 70mph optimal speed and you reverse the magnetization every 5 feet. So every 5 feet, you alternate between driving over a north pole magnet and a south pole magnet. The counter force generated by the changing current would be vertical, up or down, instead of horizontal, opposing the direction of travel. Essentially you'd be creating slight changes in upward or downward force on the vehicle, but that wouldn't really meaningfully impede the car's motion in any way. And as long as you don't have forces strong enough to make a meaningful change in the car's handling characteristics (i.e. make the force so large that the car feels 400 lbs of lift followed by 400 lbs of downforce), I don't see a downside.