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" (1)
48' (2)
48'
Not Specified
but trailers are
limited to 28'6" each
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
38,000
80,000 (5)
Width
Height
Straight Truck
Semi-Trailer
Full Trailer
Tractor &
Semi-Trailer
Tractor &
Semi-Trailer &
Full Trailer
Tractor & Triples
Other/Specials
102"
13'6" vehicle
14'0" load
45'
48' (6)
48' (7)
65'
48' trailer: 69'
53' trailer: 74'
Not Permitted (8)
Not Permitted
Seasonal weight
limits apply
Feb. 1 - Jun. 1
(1)  Height plus 6" of load, for a total of 14'0".
(2)  53' trailers may operate on designated routes.  Trailers of 48'1" to 53' require no more than 43' from kingpin to center of rear-most axle.
(3)  If gross vehicle weight exceeds 73,280 lbs., otherwise 22,000 lbs.
(4)  Two consecutive sets of tandem axles may carry a gross load of 34,000 lbs. each if the overall distance between first and last axle is 36' or more.
(5)  Or 100,000 lbs. with 6 axles.
(6)  Distance from center of rear axle of the tractor and center of the rear axle of the trailer must not exceed 38'; 53' semi-trailers with kingpin to center of rear-most trailer axle not
exceeding 43' may operate on designated routes only.
(7)  Distance from center of rear axle of the tractor and center of the rear axle of the trailer must not exceed 38'.
(8)  Not Permitted on state roads unless on designated Maine system except for reasonable access.  Call DOT 207-624-3620 for information