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Underride Guard

White Trailer Proved Invisible to Tesla's Autonomous System

A white semitrailer on a bright day proved invisible to the self-driving system of a Tesla S sedan, which failed to brake and ran under the trailer as it crossed in front of the car, said authorities investigating the first fatal crash of an autonomous car in the United States, which happened in early May.

Stronger Impact Guards Are Already Here

Absorbing an extra 5 mph amounts to almost double the force that slams into a trailer's rear, but isn't that expensive to produce, explains Tom Berg in his Trailer Talk blog.