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)
48'
Not Specified
(
2)
20,000 (3)
34,000 (4)
80,000
State/Provincial Weight & Size Limits
Steering Axle
(lb.)
Single Axle
(lb.)
Tandem Axle
(lb.)
Gross Vehicle Weight
(lb.)
Not Specified
22,400
36,000
80,000
Width
Height
Straight Truck
Semi-Trailer
Full Trailer
Tractor & Semi-Trailer
Tractor &
Semi-Trailer &
Full Trailer
Tractor & Triples
Other/Specials
102"
13'6"
45'
48' (5)
28' or less
Not Specified
if trailer is 48' or less
Not Specified
(
6)
Not Permitted
(7)
(1)  Trailers of 48' to 53' require no more than 41' spacing from kingpin to center of rear axle group.
(2)  Overall length of trailers is not specified but trailers are limited to 28' each.
(3)  If gross vehicle weight exceeds 73,280 lbs.
(4)  If gross vehicle weight exceeds 73,280 lbs.  Also, Per axle on axles not more than 8' apart; 20,000 lb. per axle on axles more than 8' apart.
(5)  53' trailers allowed on designated access highways only.
(6)  If trailers no not exceed 28' each, allowed only on designated and Interstate routes.  Not allowed on non-designated routes except on authorized reasonable access routes.
(7)  Seasonal weight limits apply; no tractor-trailer combos permitted on frost law posted highways.