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'
28'
Not Specified
(1)
20,000
38,000
80,000 (2)
State/Provincial Weight & Size Limits
Steering Axle
(lb.)
Single Axle
(lb.)
Tandem Axle
(lb.)
Gross Vehicle Weight
(lb.)
Not Specified
20,000
38,000
80,000 (2)
Width
Height
Straight Truck
Semi-Trailer
Full Trailer
Tractor &
Semi-Trailer
Tractor &
Semi-Trailer &
Full Trailer
Tractor & Triples
Other/Specials
102"
13'6"
40'
48' (3)
48'
60' (4)
Not Permitted
Not Permitted
(5)
(1)  Length of doubles not specified but trailers are limited to 28' each;  28'6" for trailers with 1982 or older year model - these combinations are restricted to a 65' overall length.
(2)  Must comply with Federal bridge formula and have 51' spacing from center of the first to center of the last axle.
(3)  53' trailers allowed on designated access highways only.
(4)  60' legal on all highways;  there is no overall length limitation for a 53' trailer on designated highways.
(5)  Tractor and full trailer combination not to exceed 60'.