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" (1)
13'6"
57'
28'6"
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.)
Not Specified
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
(2)
13'6"
40'
57' (3)(4)
57' (3)
Not Specified
28'6" plus 28'6"
plus tractor length
Not Permitted
 
(1) 102" wide vehicles permitted on highways with lane widths of 12' or greater.
(2) 102" on highways with lane widths of 12' or more, 96" on highways with lane widths under 12'.
(3) On highways with lane widths 12' or greater.
(4) Semi-trailers exceeding 53'6" shall only be operated on highways designated and shall only be operated when the distance between the kingpin and the rearmost axle, or a point
midway between the two rear axles (if the two rear axles are tandem axles), does not exceed 41'.