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)
45'
Not Specified
(
2)
20,000
34,000
80,000
State/Provincial Weight & Size Limits
Steering Axle
(lb.)
Single Axle
(lb.)
Tandem Axle
(lb.)
Gross Vehicle Weight
(lb.)
600 lb./inch
of tire width
20,000
34,000
(w/min. spacing of 40")
80,000 (3)
Width
Height
Straight Truck
Semi-Trailer
Full Trailer
Tractor &
Semi-Trailer
Tractor &
Semi-Trailer &
Full Trailer
Tractor & Triples
Other/Specials
102"
13'6"
40'
(including overhang)
53'
(including overhang)
(
1)
45'
(including overhang)
75'
(including overhang)
Not Legal
Not Legal
(4)
(1)  Trailers of 48'1" to 53' required no more than 43' from kingpin to center of rear axle group.
(2)  Length of doubles not specified but trailers are limited to 28'6" each.
(3)  Any vehicle combination with 5 or more axles with minimum spacing.
(4)  Seasonal weight limits apply and State Truck Highways are posted if less than 10 ton axle limit.  Local roads posted if other than 5 ton axle limit.