Federal & State Regulations | Size & weight limits - Arizona

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Dimension	National Network	State and Other Supplemental Highways
Width:	8' 6"	8'
Height:	14'	13' 6"
Length:	National Network	State and Other Supplemental Highways
Bus	45'	45'
Articulated bus	60'	60'
Straight Trucks	40'	40'
Straight truck and trailer	65'	65'
Tractor-semitrailer combinations	No limit	No limit
Semitrailer	57' 6"	53' or total length of 65' if semitrailer exceeds 53'
Tractor-twin-trailer combination	No limit	65'
Trailers of twin-trailer combinations	28' 6"	28' 6"
Stinger-steered	80'	80'
Overhang limitations	4' front, 6' rear	4' front, 6' rear
General overhang limitations	3' front, 6' rear	3' front, 6' rear
Drawbar	15'	15'
Length special limitations or restrictions	A vehicle transporter may transport cargo or general freight on a backhaul. A backhaul means the return trip of a vehicle transporter carrying cargo or general freight over all or part of the same route.
Weight:	Interstate and Defense Highways	State and Other Supplemental Highways
Steer axle	20,000	20,000
Single axle	20,000	20,000
Tandem axle	34,000	34,000
Gross vehicle weight	80,000 Federal Bridge Formula	80,000 Federal Bridge Formula
APU allowance	550	550
Natural gas allowance	2,000 Includes battery powered or hydrogen fuel cell systems	2,000 Includes battery powered or hydrogen fuel cell systems

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