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Buses can be charged as they drive  The Korea Advanced Institute
of Science and Technology has developed a pair of electric buses
called Online Electric Vehicles or OLEV. These buses are
different from your typical electric vehicles that have to be
parked to recharge the batteries. Instead, they can recharge
while driving down the road. Electricity is sent to the bus via
cables buried in the road with an 85% maximum power transfer
efficiency rate (the wireless charging technology is able to
supply 60 kHz and 180 kW of power at a stable and constant
rate). There is a gap of just under seven inches between the
underbody of the electric bus and the road surface. The charging
system uses Shaped Magnetic Field in Resonance [PDF] to transfer
power to the bus while it’s in motion.  The underbody of the bus
has a receiving device that is able to convert the magnetic
fields into electricity. The power strips needed to power the
bus only cover 5 to 15 percent