(Bloomberg) -- The U.S. National Highway Traffic Safety Administration is proposing that trucking companies be required to install stronger guards on their trailers to reduce deaths caused when cars rear-end tractor trailers.

The agency said Monday that underride guards, which have hung down from the back ends of box trailers for decades, should be strong enough to protect passengers in crashes of up to 35 miles per hour, an increase from the current 30 mph standard.

“Robust trailer rear-impact guards can significantly reduce the risk of death or injury to vehicle occupants in the event of a crash into the rear of a trailer or semitrailer,” said Mark Rosekind, administrator of the safety agency. “We’re always looking at ways to safeguard the motoring public, and today’s announcement moves us forward in our mission.”

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