<P> The US federal government , which only regulates the Interstate Highway System , does not set maximum length requirements ( except on auto and boat transporters ) , only minimums . Tractors can pull two or three trailers if the combination is legal in that state . Weight maximums are 20,000 lb ( 9,100 kg ) on a single axle , 34,000 lb ( 15,000 kg ) on a tandem , and 80,000 lb ( 36,000 kg ) total for any vehicle or combination . There is a maximum width of 8.5 ft ( 2.6 m ) and no maximum height . </P>
<P> The US federal government , which only regulates the Interstate Highway System , does not set maximum length requirements ( except on auto and boat transporters ) , only minimums . Tractors can pull two or three trailers if the combination is legal in that state . Weight maximums are 20,000 lb ( 9,100 kg ) on a single axle , 34,000 lb ( 15,000 kg ) on a tandem , and 80,000 lb ( 36,000 kg ) total for any vehicle or combination . There is a maximum width of 8.5 ft ( 2.6 m ) and no maximum height . </P>
what is the width of a tractor trailer truck
what is the width of a tractor trailer truck
8.5 ft ( 2.6 m )
8.5 ft ( 2.6 m )