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"
14'0"
15'0" (
1)
53'
Not Specified
Not Specified (2)
20,000
34,000
80,000
State/Provincial Weight & Size Limits
Steering Axle
(lb.)
Single Axle
(lb.)
Tandem Axle
(lb.)
Gross Vehicle Weight
(lb.)
22,000 or tire mfg. rating,
whichever is less
22,000
36,000 w/min.
spacing of 40"
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" (3)
13'6" (4)
45'
(5)
Restricted by overall
combination length
60' (6)
65' (7)
Not Permitted
(8)
(2)  Twin or Double trailer configurations are restricted to two 28-foot trailers, including load, when operated in a truck-tractor, semi-trailer, and trailer combination.  There is no
restriction on over all length.  Twin or Double trailer configurations may utilize two 28-1/2 foot trailers, including load, if the semitrailers were in actual use on December 1, 1982 and
operated in a truck-tractor, semi-trailer, and trailer combination.  These combinations are restricted to a 65 feet overall length.
(3)  When more than 10 mi. from interstate or designated highway;  otherwise 102".
(4)  When more than 10 mi. from interstate or designated highway;  otherwise 14'0".
(5)  55' including load; overall length restriction when operated more than 10 mi. from interstate or designated highway.
(6)  When trailer & load do not exceed 55';  60' overall length when operated more than 10 mi. from interstate, designated, or primary highway.
(7)  Not specified when trailer length does not exceed 28' & operated within 10 mi. of interstate, designated, or primary highway;  otherwise, 65' overall length.
(8)  Non-designated defined as primary system segments located more than 10 miles from interstate and designated routes.
(1)  When operated exclusively within commercial zones as defined in Missouri Statutes section 304.190, RSMo.