Oversize vs overweight permit
An oversize permit covers loads that exceed state legal dimensions: typically over 8.5 feet wide, 13.6 feet tall, or 53 feet long. An overweight permit covers loads exceeding state legal weights: typically 80,000 lbs gross, 20,000 lbs single axle, or 34,000 lbs tandem. A load can need either, both, or neither — the two trigger independently and most multi-state heavy moves need both.
Side-by-side comparison
| Dimension | Oversize | Overweight |
|---|---|---|
| Trigger | Width > 8.5 ft, height > 13.6 ft, or length > 53 ft | Gross > 80,000 lbs, single axle > 20,000 lbs, tandem > 34,000 lbs |
| Federal source | 23 USC §127 (interstate dimensions) | 23 USC §127 (interstate weights) |
| Cost (per state, single-trip) | $25-$80 typical | $25-$200+ scaling with weight |
| Escort requirement | Common for > 12 ft wide or > 14.6 ft tall | Less common; trigger varies by state |
| Route survey | Common for height-restricted routes | Common for bridge-load routes |
| Pilot vehicle | Width-driven — front escort common | Less common; engine-power-driven |
When you need oversize
An oversize permit is required any time the load itself or the loaded vehicle exceeds state legal dimensions. The federal interstate baseline is 8.5 ft wide, 13.6 ft tall, and (for tractor-trailers) up to 53 ft trailer + bridge length variances. Loads outside any of those dimensions on the loaded vehicle need an oversize permit per state.
Common oversize loads: wind turbine blades and towers, modular homes, large equipment (cranes, mining machines), and over-length steel beams. The permit covers a specific declared route — deviation requires permit re-issuance.
When you need overweight
An overweight permit is required when the loaded vehicle exceeds state legal weights — gross, single-axle, or tandem-axle. The federal baseline is 80,000 lbs gross with 20,000 lb single and 34,000 lb tandem caps. State-specific bridge formulas can lower the limit on certain routes; exceeding any of these triggers the permit requirement.
Common overweight loads: heavy machinery, transformers, military equipment, large concrete sections. Many overweight loads are also oversize, but heavy compact items (transformers being the canonical example) can be overweight without exceeding any dimension.
Frequently asked questions
Can a load be oversize without being overweight?
Yes. A long, light load (a wind turbine blade at 110 feet but under 80,000 lbs gross) is oversize but legal-weight. The carrier needs an oversize permit but not an overweight permit. The two trigger independently.
Can a load be overweight without being oversize?
Yes. A compact heavy load (a transformer at 95,000 lbs but within 8.5 ft wide and 14 ft tall) is overweight but legal-size. The carrier needs an overweight permit only.
Do oversize and overweight permits cost the same?
No, and the difference matters. Oversize permits typically run $25-$80 per state. Overweight permits often add weight-based surcharges that scale with how far over the limit the load runs — a 5,000-lb-over permit costs less than a 50,000-lb-over permit even in the same state.
Oversize, overweight, or both — we file all of them
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