ATDynamics, San Francisco, announced that its aerodynamic TrailerTail device has received an exemption from the U.S. Department of Transportation's length restrictions on commercial motor vehicles.

The agency has confirmed that the TrailerTail meets federal standards of crash safety, lighting and conspicuity, and size.

The TrailerTail fairing is constructed of lightweight, durable panels designed to endure daily wear and driver abuse. Its patented design collapses from 4 feet 3 inches in length in less than six seconds, folding flat against rear swing-doors of dry van, refrigerated and drop-deck trailers to maintain normal access to cargo.

Third-party SAE J1321 testing conducted in 2007 showed that the TrailerTail boosts fuel efficiency by 5.1 percent at 62 mph. The product's performance has been recognized by the U.S. EPA SmartWay program and the California Air Resources Board, which considers the TrailerTail to be sufficient for compliance with a prospective state law mandating the use of aerodynamic devices on 53-foot trailers.

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