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' (1)
28'6"
Not Specified (2)
20,000
34,000
164,000
State/Provincial Weight & Size Limits
Steering Axle
(lb.)
Single Axle
(lb.)
Tandem Axle
(lb.)
Gross Vehicle Weight
(lb.)
700 lb./sq.inch
18,000
16,000 lb./axle
164,000
Width
Height
Straight Truck
Semi-Trailer
Full Trailer
Tractor &
Semi-Trailer
Tractor &
Semi-Trailer &
Full Trailer
Tractor & Triples
Other/Specials
96" (3)
13'6"
40'
50' (4)
28'6"
(5)
59' (6)
Not Permitted
Seasonal weight
limits apply; frost
info: 800-787-8960
(1)  Trailers over 50' require no less than 37'6" and not more than 40'6" spacing, plus or minus 6", as measured from kingpin to center of rearmost axle, or axle group.
(2)  Length of doubles not specified providing each trailer does not exceed 28'6"; or the overall length is 58' for the trailing units including space between when coupled together.
(3)  102" are allowed on designated highways only.
(4)  On designated routes - 53' and has no more than 2 axles.  And require trailers over 50'  have tandem setting no less than 37'6" and no more than 40'6" spacing, plus or minus 6",
as measured from kingpin to center of rearmost axle, or axle group.
(5)  59' overall length on non-designated routes.  65' overall length on designated routes.
(6)  On non-designated routes.  On designated routes - no overall length if (1) length of trailer, or semi-trailer, does not exceed 28'6":  (2) overall length of trailers in combination does
not exceed 58', including space between trailers.