http://www.christian-foerg.de/portal/project14_1.html

Here's an interesting idea. German designer Christian Förg has fleshed out his concept for extended range electric vehicles, without carrying an on-board generator. Put the motor itself in the road. While the vehicle concept may not be to everyone taste, this concept could in fact work with any electric vehicle.

Förg calls it a Speedway Transport System concept. The idea is, around town a car has it's own EV powertrain including motor, inverter and battery, a standard EV. When on the highway the power source is a linear induction motor embedded into the road surface. When the EV is on the linear motor road system the entire powertrain in the EV can either shut down or remain on stand by.

Förg says the linear motor can also charge an electric car’s battery so it’s ready for urban travel. “Only highways for long range distances will need to be upgraded,” he says “But even with this upgrade, the streets still can be used by conventional cars.”
http://electric-vehicles-cars-bikes.blogspot.com/2009/08/linear-motor-ev-highway-concept.html