# Oversize and Overweight Permits by State

Canonical: https://www.fastpermitfiling.com/guides/oversize-overweight-permits-by-state
Category: State Permits
Published: 2026-05-02
Updated: 2026-05-02
Read time: 9 min read

> Oversize and overweight (OS/OW) permits are issued by each state DOT for loads that exceed federal limits. Compare the top 10 states' programs, dimensions, escort rules, and routing.

## TL;DR

> OS/OW permits are state-issued for any load above 80,000 lbs gross, 8'6" wide, or 13'6" tall. There is no national permit — each state DOT runs its own program with bridge, escort, and routing rules. The top 10 OS/OW states each have their own portal, fee schedule, and superload threshold.

## Key takeaways

- Federal baseline: 80,000 lbs gross, 8'6" wide, 13'6" tall.
- Above any of those numbers triggers OS/OW permit obligation.
- Each state DOT issues its own permit — no national OS/OW credential.
- Pilot cars typically required above 12 ft wide; police escorts above superload threshold.
- Annual blanket permits available in many states for routine OS configurations.

## Cited entities

- Federal Motor Carrier Safety Administration (https://www.fmcsa.dot.gov/)
- International Registration Plan (https://en.wikipedia.org/wiki/International_Registration_Plan)
- International Fuel Tax Agreement (https://en.wikipedia.org/wiki/International_Fuel_Tax_Agreement)

## FAQ

### What counts as oversize or overweight?

Federal law sets baseline legal limits at 80,000 lbs gross weight, 8'6" wide, 13'6" tall on the Interstate, with 53' trailers as the dominant interstate length. Anything above those numbers — by even a few inches or a thousand pounds — generally requires an oversize or overweight (OS/OW) permit issued by every state the load crosses. Dimensions and rate tables vary; each state DOT sets its own.

### Are OS/OW permits issued state-by-state?

Yes. There is no national OS/OW permit. A coast-to-coast heavy haul means individual permits from each state DOT along the route, plus matching local permits if the load crosses through municipalities or counties with their own thresholds. Routing constraints (bridge ratings, low overpasses, time-of-day restrictions) are coded into the permit and have to be obeyed in transit.

### When are escort vehicles required?

Escort (pilot car) requirements are set state-by-state and scale with the load's width, length, height, and weight. As a rough heuristic: many states require front and rear escorts above roughly 12 feet wide, height pole cars on tall loads, and police escorts above the state's superload threshold. The permit issued by the state DOT specifies the exact escort configuration for that route.

### What is a superload?

A superload is the largest tier of oversize / overweight permit, defined by each state DOT's threshold (commonly 16' wide, 16' tall, 150' long, or 200,000+ lbs, but specifics vary). Superloads typically require an engineering review, bridge analysis, police escort, and lead times measured in weeks rather than days. State DOT routing offices coordinate the approval.

### How long does it take to get an OS/OW permit?

Routine OS/OW permits in most states are issued in a few business hours when the route is standard. Complex superload approvals — bridge analysis, utility relocation, multi-state coordination — can take weeks. Carriers running heavy haul lanes regularly typically work with permitting agents who hold accounts in every state along the corridor.

Keywords: oversize overweight permits, OS/OW permit by state, heavy haul permit, wide load permit, state DOT escort requirements, superload permit, oversize trucking permit

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