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"
13'6"
53'6" (1)
28'
Not Specified
but trailers are
limited to 28' each
20,340
34,000 (2)
80,000
State/Provincial Weight & Size Limits
Steering Axle
(lb.)
Single Axle
(lb.)
Tandem Axle
(lb.)
Gross Vehicle Weight
(lb.)
Not Specified
20,340
40,680 (2)
80,000
Width
Height
Straight Truck
Semi-Trailer
Full Trailer
Tractor &
Semi-Trailer
Tractor &
Semi-Trailer &
Full Trailer
Tractor & Triples
Other/Specials
102" (3)
13'6"
Not Designated
53'6" (1)
53'
100'
(4)
Not Legal
 
(1) Semi-trailers which exceeds 48' shall not have a kingpin distance greater than 41' from kingpin to midway point between the tandem axles, and safety underride guard that extends
across the rear of the trailer to within 18" of the lateral extremities and at a height of not more than 30" from the ground.
(2) If gross weight is less than 73,280 lbs. and length is less than 55', then the tandem weight is 40,680 lbs.
(3) 102" on roads with 12' or wider lane widths.
(4) Unlimited length if each trailer is 28' or less.