Peterbilt voluntarily recalled more than 2,000 semi-tractors because they can travel at speeds greater than their tires can safely handle. The tractor recalls effect 2009-2016 model years because they can travel faster than 75 mph, even though the maximum speed their Michelin tires can handle is 65 mph. The trucks at issue are primarily used as car-haulers. It is noteworthy NHTSA has proposed a regulation limiting top speeds of big rigs nationwide to below 75 mph. Other associations and safety advocates have proposed a 68 mph limit.