Electric vehicles have become very common today. Although almost everyone knows about them and their environmental benefits, the majority of car owners prefer traditional cars because they still have many advantages and are more convenient compared to electric vehicles. One major limit of electric vehicles is charging, and the availability of the associated infrastructures. The Korea Advanced Institute of Science and Technology (KAIST) has come up with a potential solution, the Online Electric Vehicle (OLEV). 

The OLEVs are electric vehicles that can charge whilst stationary or running without pantograph-supported electric wires. They have been used as public transit trams in several projects in South Korea. The OLEVs receive their energy wirelessly from road surface, which has electrical cables buried underneath. The technology eliminates the need of stopping at charging stations. 

The transfer of energy has a high efficiency of 85%, but the new system is still expensive for the country or municipality to implement, though the length of power strips to be installed is only 5-15% of that of the entire road. However, this technology has revolutionized the usage of electric vehicles, and offers a great opportunity for public transportation systems. 

http://phys.org/news/2013-08-wireless-online-electric-vehicle-olev.html#inlRlv