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' (5)
28'6"
Not Specified
but trailers are
limited to 28'6" each
20,000
34,000
80,000
State/Provincial Weight & Size Limits
Steering Axle
(lb.)
Single Axle
(lb.)
Tandem Axle
(lb.)
Gross Vehicle Weight
(lb.)
18,000
18,000 (1)
32,000 (2)
73,280 (3)
Width
Height
Straight Truck
Semi-Trailer
Full Trailer
Tractor &
Semi-Trailer
Tractor &
Semi-Trailer &
Full Trailer
Tractor & Triples
Other/Specials
96" (4)
13'6"
42'
53' (5)
53' (Single)
28'6" (Doubles)
(6)
65' (7)
Not Permitted
 
(1) 20,000 lb. limit on Class I, II and III highways.
(2) 34,000 lb. limit on Class I, II and III highways.
(3) 80,000 lb. limit on Class I, II and III highways.
(4) 102" are allowed on Class I and II highways.
(5) Trailers longer than 48' must not exceed: 45'6" from kingpin to rear axle on Class I and II highways; 42'6" from kingpin to rear axle on Class I and other non-designated highways.
(6) 65' overall length (bumper to bumper) and/or 55' from center of front axle to center of rear axle.
(7) Overall on Class III and non-designated highways.