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DimensionNational NetworkState and Other Supplemental Highways
Width:8' 6"8' 6"
Height:13' 6"
plus 6" of load, 13' 6" limit on Turnpike		13' 6"
plus 6" of load, 13' 6" limit on Turnpike
Length:National NetworkOn all Other
Bus45'45'
Articulated bus
Straight Trucks45'45'
Straight truck and trailer65'65'
Tractor-semitrailer combinationsNo limit
with legal trailer		69'
with 48' trailer, 74' with 53' trailer
Semitrailer53'
see KPRA		53'
see KPRA
Tractor-twin-trailer combinationNo limit
with legal trailer		N/S
28' 6" semi-trailer and 28' 6" straight trailer
Trailers of twin-trailer combinations28' 6"28' 6"
Boat-transporter combination
Overhang limitations
Stinger-steered boat-transporter
Overhang limitations
Auto-transporter
Overhang limitations
Stinger-steered auto-transporter80'
on interstate
Overhang limitations4' front, 6' rearNS
Saddlemount97'97'
General overhang limitations
Drawbar
Dromedary
Kingpin to rearaxle45' 6"
to the center of the rearmost axle		45' 6"
to the center of the rearmost axle. Overall length not to exceed 74' on non-National Network highways.
Length special limitations or restrictionsAll trailers over 48' must display a sign on the rear of the trailer stating that the vehicle/combination has a wide turning radius.
Weight: Interstate and Defense HighwaysOn all Other
Steer axle600
per inch width of tire or manufacturers rating		600
per inch width of tire or manufacturers rating
Single axle20,000 20,000
Tandem axle34,000 38,000
Tridem axle48,000
50,000 lb on a 6-axle combination
Gross vehicle weight80,000
100,000 lb on a 3-axle truck-tractor and tri-axle semitrailer on the Maine Turnpike		80,000
100,000 lb conditionally on a 3-axle truck-tractor and tri-axle semitrailer
Load per inch width of tire600
or manufacturer’s rating		600
or manufacturer’s rating
Per wheel
Tolerances
APU allowance400400
Natural gas allowance
Weight special limitations or restrictionsAddition allowances for special commodity vehicles

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['Size and Weight Limits']
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