IEEE story about induction loops... apparently the technology would allow greater than 185mph speeds (for high speed trains):
The All-Electric Car You Never Plug In - IEEE Spectrum. I agree with RedDevil... the induction coils don't need to be laid down everywhere, just at key spots along the route. Since the power can be significantly higher than a home charger (100kW vs ~8kW for a level 2 240V charger), it'd be possible to get a good boost by driving along a 10 mile "EV Charging Lane". Pricey to build, though I suppose it could be supported by a toll system (similar to the SF Bay area's FasTrak system).