The nation's largest trucking industry group wants the government to get moving on a rule requiring speed-limiters on big rigs.
The American Trucking Associations proposed the limiters in 2006, but the rule has been stuck in the government bureaucracy.
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The group says capping heavy truck speeds at 65 miles per hour would make the roads safer.
The call follows a story by The Associated Press last month revealing that most big truck tires aren't designed to go over 75 mph. Yet 14 states have speed limits of 75 or above. Texas, Wyoming, Utah and South Dakota have limits of 80 or higher.
Transportation Department documents show the rule has been stalled in Secretary Anthony Foxx's office since August.
Messages were left Monday for a department spokesman.