The idea of a highway which automatically charges you electric car while driving is not new. A working "prototype" of this idea, on the other hand, is. Toyohashi University of Technology has developed EVER , Electric Vehicle on Electric Roadway. Using induction, scientists succeeded in transmitting 50 to 60 watt through a 10cm layer of concrete. This electricity then is received by metal plates in the vehicles wheel which then initiates a movement. Efficiency of this technology should be around 80 - 90%.
This project only shows the possibilities, however, this technology will not be implemented in the near future. New highways have to be build, electrical cars should be widely used and before all that, the technology has to be improved a 100 times the current strength.