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Guides

Permit rules, in plain English.

Four reference guides for owner-operators and dispatchers who need the answer now, not a brochure. Every number below is read off an official state DOT publication and carries the date it was checked.

Four guides

Cost

Oversize permit cost by state, 2026

What each state DOT actually charges for a single-trip OS/OW permit — all 48, and why thirteen of them cannot be reduced to one number. Searchable, sortable, every figure dated and linked to its source.

8 min read · 48 states
Flat-rate states, low to high
$6 – $75

New Hampshire is lowest at $6, Ohio highest at $75. Thirteen states do not use a flat rate at all — they price on weight, width, envelope or distance.

Weight

Weight limits by state

Gross, single, tandem, tridem and quad for all 48, the bridge formula worked through, and the two states where the legal gross rises with the axle count — Michigan reaches 164,000 lbs at eleven. Plus what each state charges to go over.

9 min read · 48 states
Rules

When do you actually need an oversize permit?

The federal baseline is 8'6" wide, 13'6" high, 53' trailer and 80,000 lbs — but that height figure is only right in about half the country. Where states go stricter, and the divisible-load rule that gets drivers ticketed.

6 min read
Escorts

Pilot car requirements by state

Escort rules are a function of dimension and road tier — the same load can need a front escort on a two-lane and a rear escort on a multilane. Plus night, weekend and holiday blackouts.

7 min read
Rules

What is a superload?

There is no federal definition — each state sets its own trigger, and they range from 14 to 18 feet wide. All 48 states’ triggers on width, height, length and weight, plus the 26 published review windows.

8 min read · 48 states
Sourced from official DOT publications48 contiguous statesLast verified September 1, 2026
Common questions

About this data

How often is this data updated?

Each state's figures carry their own verification date. We re-read the source fee schedule on a rolling cycle and republish when a DOT changes a number, so a stale figure is dated rather than silently wrong.

Why do some states show “Pending” instead of a fee?

Because we have not yet verified that state's figure against its own DOT publication. Publishing an estimate that looks authoritative is how every other permit blog ends up quoting numbers that are years out of date. Call us and we will price any state today.

Is Permigo's $20 fee included in the figures shown?

No. Every figure in these guides is the state DOT's own fee. Permigo's flat $20 service fee per state permit is separate and always shown separately.

Skip the reading. We’ll file it.

$20 flat per state permit. A permit agent answers, 7am–7pm CT, seven days a week.