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Legal dimensions

Measure	Legal maximum
Width	8' 6"
Height	13' 6"
Length, semi-trailer	53'
Length, single vehicle	45'
Length, overall	74'
Front overhang	—
Rear overhang	—

Legal weights

Measure	Legal maximum
Gross vehicle weight	80,000 lbs
Gross weight, single vehicle	—
Single axle	20,000 lbs
Tandem axle	34,000 lbs
Tridem axle	42,000 lbs
Single axle, non-divisible	—
Tandem axle, non-divisible	—
Tridem axle, non-divisible	—

Last checked September 2026. States revise legal limits, and a limit can depend on the road, the axle spacing or the configuration in ways one table cannot capture. Maine is the authority — use this to plan, and confirm anything you are close to.