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"
53' (2)
28'
Not Specified
but trailers are
limited to 28' each
22,400 (3)
36,000 (4)
80,000 (5)
State/Provincial Weight & Size Limits
Steering Axle
(lb.)
Single Axle
(lb.)
Tandem Axle
(lb.)
Gross Vehicle Weight
(lb.)
Not Specified
22,400
36,000 (4)
80,000 (6)
Width
Height
Straight Truck
Semi-Trailer
Full Trailer
Tractor & Semi-Trailer
Tractor &
Semi-Trailer &
Full Trailer
Tractor & Triples
Other/Specials
102"
13'6"
45'
48'
Not Specified
Not Specified
if trailer is 48' or less
Not Permitted
Not Permitted
 
(1) Metric equivalent 102.36"
(2) Semi-trailers greater than 48' and less than or equal to 53' require a distance of not more than 43' from kingpin to center of rearmost axle with tires in contact with roadway. Trailers
of 48' or less; no kingpin axle requirements.
(3) Axles space greater than 6' apart.
(4) If axles are less than 6' apart, 18,000 lbs. per axle in tandem axle. If axles are greater than 6' apart, 22,400 lbs. per axle in tandem axle.
(5) Must comply with Federal bridge formula and have 51' spacing from center of the first to center of the last axle.
(6) 5-alxe unit with 51' spacing between first and fifth axle.