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"
14'0"
53'
(1)
53'
61'
(2)
20,000
34,000
105,500
(3)
State/Provincial Weight & Size Limits
Steering Axle
(lb.)
Single Axle
(lb.)
Tandem Axle
(lb.)
Gross Vehicle Weight
(lb.)
(4)
20,000
34,000
105,500
(5)
Width
Height
Straight Truck
Semi-Trailer
Full Trailer
Tractor &
Semi-Trailer
Tractor &
Semi-Trailer &
Full Trailer
Tractor & Triples
Other/Specials
102"
14'0"
40'
53'
(1)
53'
Not Specified
if trailer is 53'
or less
61'
(2)
Not Permitted
(6)
(1)  Trailers from 53' to 56' require a permit.
(2)  Trailers from 61' to 68' require a permit.
(3)  Provided vehicle complies with Federal bridge gross weight formula.
(4)  600 lb./inch of tire width;  all other tires are limited to 500 lb./inch of tire width.
(5)  Refer to Federal formula B.
(6)  Truck & trailer - 75';  Seasonal weight limits apply;  postings are available at Ports of Entry.