The type of data structure shown would be classified as a ____ type. 
Definitions:
Highway Tractor
A type of heavy-duty vehicle designed primarily for hauling trailers over long distances on highways.
Tandem Drive
Tandem drive refers to a vehicle configuration where two sets of drive axles are arranged in a row, commonly seen in heavy-duty trucks, to distribute weight and increase traction.
Axles
Mechanical components that connect wheels on opposite sides of a vehicle, transferring power from the drivetrain to the wheels for movement.
Freight Volume
The amount of goods, cargo, or freight being transported or capable of being transported.
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