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Efficiency of road embedded inductive charging systems isn't even the big issue that precludes it's consideration. The hardware is massively material intensive. building out massive coils into every highway at a capacity to keep big trucks nominally charged is another fantasy concept that can't happen.
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Even fixed inductive charge stations for autonomous cabs and busses are of limited value because the charge rates are limited to whatever massive, heavy, and expensive, size of a coil that you feel like dragging around in the car. Electric busses will be much better to have the operator just step out to plug in for a few minuted while people get on and off. And if you want a a high tech solution for charging an roving autonomous fleet, I would recommend developing a standardized contact plate system that would reach up and touch the matching plates on the underside of the vehicle after sliding covers are retracted.
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In large cities where travel areas are dense it will be a long time before even this makes more sense than just having human attendants running up and down at large charging lots, plugging and unplugging vehicles to keep them charged.
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Overnight inducutive charging systems in a home garage for people that are too lazy to plug in might find a few takers. But thinking that we are going to run heavy transport on inductive highways is , again, impossible.
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