In South Korea is a public transport system be taken into use with electrically-powered buses, the required flow of electricity cables in the road surface are processed. Thanks to magnetic induction is a bus contact of sufficient power.
At a distance of 24 km in the South Korean city of Gumi is a project started to drive the buses with electric motors that are predominantly dependent on non-contact power supply. The power supply comes from under the road surface which approximately thirty centimetres of depth, the cables are processed. The cables will be high voltage of 440V and 200A are conducted with a frequency of 20kHz.
Thanks to magnetic induction, with the bottom of the bus at about seventeen inches of the road surface, the necessary received power, the bus on the route flow ‘refueling’ for his electric motor. The energy transfer would be an efficiency of 85 percent can be achieved.
Because the electric buses on parts of the track not above the underground electricity network drive, are there batteries in the vehicle, reports ExtremeTech. Nevertheless, it is the number of batteries thanks to the designed system with two-thirds and reduced the bus to a relatively low weight. That would make the buses more energy efficient than electric buses with normal batteries.
Furthermore, the buses, thanks to the system is not stationary charged need to be and no problems with limited range should have. In the next years, the fleet of adapted buses will be extended and would be a larger part of the road network to be adjusted. 
