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"
53'
40'
Not Specified
(1)
20,000
34,000
80,000
(2)
State/Provincial Weight & Size Limits
Steering Axle
(lb.)
Single Axle
(lb.)
Tandem Axle
(lb.)
Gross Vehicle Weight
(lb.)
600 lb./inch of tire width
up to 20,000 lbs.
20,000
34,000
80,000
Width
Height
Straight Truck
Semi-Trailer
Full Trailer
Tractor &
Semi-Trailer
Tractor &
Semi-Trailer &
Full Trailer
Tractor & Triples
Other/Specials
102"
14'0"
40'
53'
40'
(3)
(4)
(5)
(6)
(1)  Overall length not specified if trailing units, including space between, do not exceed 68' and first semitrailer does not exceed 40'.
(2)  Two consecutive sets of tandem axles may carry a gross load of 34,000 lb. each if the overall distance between the first and last axle is 36' or more.  An interstate Weight Permit is
available that allows 34,000 lb. on each tandem axle if the overall length between tandems is 30' or more.  Call 503-373-0000.
(3)  60' overall on all Group 1 highways with maximum 53' trailer.  No overall length limit on national Network highways with a maximum 53' trailer.
(4)  [1] 75' overall on Group 1 highways;  first trailer in combination not to exceed 40'.  [2] No overall length limit on Group 1 highways if the measurement from the front of the first trailer
to the rear of the second trailer does not exceed 60' (including distance between trailers).  [3] If distance from the front of the first trailer to the rear of the second trailer exceeds 60' (up to
a maximum of 68') and overall length exceeds 75', see Route Map 7 for designated routes that allow no limit in overall length.
(5)  Allowed on Interstate and state-designated routes by permit only.
(6)  Route Map 7 can be obtained from the Oregon Department of Transportation or at Ports of Entry.