But when it landed, the pilot could take off the wings and propeller and drive it like any other car.

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Dale Ogden told CNN affiliate KING that he was driving near the tractor-trailer's pilot car when he saw a device on that car designed to indicate whether a truck can clear an obstacle hit the top of the bridge.

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This will be used by Andy Green, a Royal Air Force pilot who will drive the car, to get the vehicle moving.

ECONOMIST: The land-speed record

He highlighted an insurance company's decision to pilot a pay as you drive car insurance which makes use of a satellite box in the car.

BBC: NEWS | UK | UK Politics | At-a-glance: Road charge plans