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"
14'6" (1)
57'4" (2)
57'4" (3)
Not Specified
but trailers are
limited to 28'6" each
20,000
36,000
80,000
State/Provincial Weight & Size Limits
Steering Axle
(lb.)
Single Axle
(lb.)
Tandem Axle
(lb.)
Gross Vehicle Weight
(lb.)
20,000
20,000
40,000
85,000
Width
Height
Straight Truck
Semi-Trailer
Full Trailer
Tractor &
Semi-Trailer
Tractor &
Semi-Trailer &
Full Trailer
Tractor & Triples
Other/Specials
102"
13'0" (4)
45'
57'4"
28'6
(5)
(6)
(7)
 
(1) Height limit of 13'0" for all roads that are not designated routes.
(2) No overall length limit for tractor- semi-trailer combination with a single trailer length of 57'4" or less.  75' overall length limit applies to specialized haulers including boat and auto
transporters.
(3) No overall length specified for tractor and full 57'4" trailer.
(4) 14'6" on state designated highways only.
(5) No overall length limit for a combination with a single trailer length of 57'4" or less in length.
(6) No overall length limit for a combination of units with trailers 28'6" or less in length.
(7) Permitted on selected Interstate routes and to access to their terminals.