The American Driver
From Drivers...For Drivers
National Weight & Size Provisions
Width
Height
Semi-Trailer in
Tractor-Semi-Trailer Combo
Full Trailer
Doubles
Single Axle
(lb.)
Tandem Axle
(lb.)
Gross Vehicle Weight
(lb.)
102"
14'0"
53' (1)
Not Specified
Not Specified
but trailers are
limited to 28'6" each
20,000
34,000
80,000
State/Provincial Weight & Size Limits
Steering Axle
(lb.)
Single Axle
(lb.)
Tandem Axle
(lb.)
Gross Vehicle Weight
(lb.)
20,000
20,000
34,000
80,000
Width
Height
Straight Truck
Semi-Trailer
Full Trailer
Tractor &
Semi-Trailer
Tractor &
Semi-Trailer &
Full Trailer
Tractor & Triples
Other/Specials
102"
14'0"
40'
(2)
Not Specified
65'
(3)
Not Permitted
 
(1) All trailers over 48' up to and including 53' trailers require no more than 40' spacing from kingpin to center of rear axle.
(2) 38' maximum from kingpin to center of rear axle on single axle trailers; unlimited with 40' maximum from kingpin to center of rear axle on 2 or more axle trailers.
(3) 75' if trailers not more than 28'6" each; 65' if either trailer is greater than 28'6".