
NHTSA is mulling a side-underride guard mandate for semi-trailers, but more than a dozen cities now demand companies bidding on contracts use them.
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The National Highway Traffic Safety Administration published the results of its research on costs and benefits of mandated side underride guards for truck trailers. But in the advance notice of proposed rulemaking, the agency acknowledged that it lacks information on a large number of factors that could affect those calculations.
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