SINGAPORE (July 24): On an overcast summer’s day, in the outskirts of Gothenburg, the port city on the southwestern coast of Sweden, three trailer trucks are lined up along a wide, oval track. On signal, they start off in unison, one close behind the other. After a while, the drivers in the second and third trucks pick up their radios to talk to each other, gesturing; their hands are completely off the steering wheel.

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