PORTLAND — Jason Nord poked his head out the window of a hulking Freightliner 18-wheeler as he practiced backing the rig between rows of orange cones at the Western Pacific Truck School in Portland.

The exercise required the rookie driver to use skillful maneuvers to coax the truck and its trailer into a slot that simulated a warehouse loading dock. One by one, students took their turn behind the wheel while instructors on the ground offered guidance.

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