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Your toothbrush charger has a magnetic stub that sticks up into the brush so the gap between the two coils isn't too large.
How big a gap is there between the pavement 'coils' and the bus's receiver coil?
And what do the 'in-pavement' coils look like?
A long series of separate coils that are fired up as the bus passes or is the entire pavement energized all the time?
Too complex and inefficient to be viable with today's technology.