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Ohio is highlighted. Select the other states on your route to compare their limits.

Legal dimensions

Measure	Legal maximum
Width	8' 6"
Height	13' 6"
Length, semi-trailer	53'
Length, single vehicle	45'
Length, overall	75'
Front overhang	3'
Rear overhang	4'

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	—
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. Ohio is the authority — use this to plan, and confirm anything you are close to.