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'
Not Specified
Not Specified
but trailers are
limited to 28'6" each
20,000
34,000 (1)(4)
80,000
State/Provincial Weight & Size Limits
Steering Axle
(lb.)
Single Axle
(lb.)
Tandem Axle
(lb.)
Gross Vehicle Weight
(lb.)
20,000
20,000
34,000 (4)
80,000
Width
Height
Straight Truck
Semi-Trailer
Full Trailer
Tractor &
Semi-Trailer
Tractor &
Semi-Trailer &
Full Trailer
Tractor & Triples
Other/Specials
102" (2)
13'6"
40'
53'
53'
Not Specified
if trailer is 28'6" or
less
Not Specified
if trailer is 28'6"
or less
Not Permitted
(3)
(1) If gross vehicle weight and registered gross weight both exceed 73,280 lbs.
(2) On numbered routes unless posted.
(3) Truckers map can be obtained from the PA Department of Transportation or at Welcome Centers.
(4) Axle weights - trucks and combination vehicles with registered gross weight of 73,280 lbs. or less:
center-to center
distance between to
adjacent axles
under 6'
6' to 8'
over 8'
maximum axle weight (pounds)
1 of 2 adjacent axles
 other adjacent axle
18,000 lb.
18,000 lb.
22,400 lb.
18,000 lb.
22,400 lb.
22,400 lb.