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"
48' (1)
28'
Not Specified
but trailers are
limited to 28' each
20,000 (2)
34,000 (3)
80,000 (4)
State/Provincial Weight & Size Limits
Steering Axle
(lb.)
Single Axle
(lb.)
Tandem Axle
(lb.)
Gross Vehicle Weight
(lb.)
Tire Manufacturing
Rating
20,000 (5)
34,000
80,000
by bridge formula
Width
Height
Straight Truck
Semi-Trailer
Full Trailer
Tractor &
Semi-Trailer
Tractor &
Semi-Trailer &
Full Trailer
Tractor & Triples
Other/Specials
96" (6)
13'6"
40'
including
overhang
48' (7)
28' each
Not Specified (8)
Not Permitted (9)
(10)
 
(1) 53' trailers allowed only on Interstate routes in National Network and on Maryland State Highway Designated Routes. Trailers in excess of 48' require no more than 41' spacing from
kingpin to center of rear tandem and can have no more than 35% of that distance as overhang measured from the center of the rear tandem to the end of the trailer.
(2) If gross vehicle weight exceeds 73,000 lbs. Weight on tires shall not exceed maximum allowed by manufacturer. If registered or operating weight is less than 73,000 lbs., single
axles allowed 22,400 lbs. Consecutiver single axles must comply with bridge formula.
(3) 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. Weight on tires shall not exceed
maximum allowed by manufacturer.
(4) Provided vehicle complies with Federal bridge gross weight formula. Weight on tires shall not exceed maximum allowed by manufacturer.
(5) Vehicles registered or operating 73,000 lbs. and under allowed 22,400 lbs. on single axles. Vehicles over 73,000 lbs. allowed 20,000 lbs. Consecutive single axles must comply
with bridge formula.
(6) 102" on all interstate & certain designated state highways.
(7) Semi-trailers up to 53' permitted with certain restrictions pertaining to kingpin setback; semi-trailers in excess of 48' are not permitted off Maryland Truck Route System.
(8) Except semi-trailer length restricted to 48' on non-designated routes.
(9) Except on Interstate System and up to 1 mi. to terminals or facilities for food, fuel and rest.
(10) Cargo carrying power units restricted to 62' except auto transporters on Interstate and designated highways, which are allowed 65' conventional and 75' stingers.