The airport is purchasing the 40-foot buses to shuttle riders from the economy parking lots to both terminals.
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"RDU's new electric buses will provide a quieter, eco-friendly transportation experience for our customers," said Michael Landguth, president and CEO of the Raleigh-Durham Airport Authority. "We're most excited about the environmental benefits these buses provide."
The airport authority says the zero-emission buses will provide a quieter ride and quicker acceleration.
RDU bought the four buses for just over $3 million, almost half of which was paid with federal grant funds.
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They are the first electric buses in the Triangle.
Right now, the airport uses 14 buses that run on diesel.
The electric buses will make their debut next month.