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Mississippi · Oversize & Overweight

Mississippi Oversize & Overweight Permits filed with MDOT for you, 24/7

In Mississippi, a load over 8 ft 6 in wide, 13 ft 6 in high, 99 ft long or 80,000 lbs needs an MDOT permit, issued through ExpressPass. A single-trip permit is valid for up to three consecutive days, and loads up to 14 ft wide, 14 ft high and 120 ft long can run all year on a 365-day blanket. Send us the load and route: our permit desk quotes the price and files it for you.

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What will an oversize permit in Mississippi cost?

Enter your pickup and delivery locations, choose your permit type, and compare estimated permit costs across route options.

  1. Oversize and overweight permits across the lower 48 and DC
  2. State-by-state fee breakdown for each route option
  3. Order your permit or talk to a specialist
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Mississippi rules

Mississippi legal limits and permit rules

The size and weight Mississippi allows without a permit, when MDOT requires escorts and when a permitted load may run.

Legal limits without a permit

Width
8 ft 6 in
Height
13 ft 6 in
Overall length
99 ft
Trailer
53 ft
Front projection
3 ft
Single axle
20,000 lbs
Tandem axle
34,000 lbs
Gross weight
80,000 lbs

Escorts

13 ft wide or more, two-lane, daylight
Front escort plus flashing amber lights
13 ft wide or more, divided highway
Rear escort
10 ft wide or more, at night
Front on two-lane, rear on divided highways
Over 99 ft long
Front, rear or both
Overhang of 15 ft or more
Escort required
18 ft wide or more
Police escort may be required
Superload from 15 ft 7 in high
Height pole
Superload from 160 ft long, 15 ft 9 in high or 300,000 lbs
Two police escorts

When you can move

Over 12 ft wide
30 min after sunrise to 30 min before sunset
Night moves
Only up to 12 ft wide, 150,000 lbs or 99 ft long
Holidays
New Year's, Memorial Day, July 4, Labor Day, Thanksgiving, Christmas: from noon the day before
Weather, over-width loads
Not under 500 ft of visibility, on hazardous pavement or in high wind
Posted bridges
No permitted movement

Source: MDOT Permit & Motor Carrier Division Manual (January 13, 2026), MDOT Administrative Code Sub-Part 6301, MDOT Mississippi Maximum Weight Laws, MDOT over-dimensional FAQ. Your permit's own conditions always apply.

Which permit you need

Mississippi permits for oversize and overweight loads

  1. One move, or there and back

    Single-trip permit

    Valid for up to three consecutive days, filed online in ExpressPass. Round-trip permits are available.

  2. Up to 14 ft wide, 14 ft high and 120 ft long

    Oversize blanket permit

    365 days of movement within the envelope, with up to 14 ft 11 in of rear overhang.

  3. Heavy equipment

    Special heavy equipment blanket

    Equipment up to 150,000 lbs, with movement allowed around the clock.

  4. 17 ft wide, 121 ft long, 15 ft 7 in high or 189,999 lbs and up

    Superload permit

    Needs a route survey and a traffic control plan before MDOT issues it.

Routes and road rules

Where Mississippi routes add their own rules

Mississippi's weight map, its bridges and the interstates set limits beyond the permit.

  1. Red Line and Black Line highways

    Mississippi marks its highways by weight. Red Line highways take up to 80,000 lbs; on Black Line highways axle groups are capped at 57,650 lbs.

    Route:We check the line of every highway on the route.

  2. Posted bridges

    No permitted load may move on a posted bridge, and MDOT may require escorts on bridges along the route.

    Enforcement:The Department of Public Safety enforces permit conditions.

  3. Harvest loads and the interstate

    The annual harvest permit keeps farm products, unprocessed forest products, sand and gravel off the interstates, except US 78 from mile marker 0 to 113 in north Mississippi.

    Weight:80,000 lbs plus a 10% tolerance, 88,000 lbs.

  4. Port containers

    Sealed containers moving to or from a port for import or export can run up to 95,000 lbs on a single-trip or blanket permit.

    Covers:Import and export moves only.

Mississippi loads

Mississippi permits for the loads Mississippi hauls

MDOT writes permits for timber, utility poles, hay and long freight.

  1. Timber

    Forestry and timber permits

    A forestry equipment blanket up to 100,000 lbs and 14 ft wide, a timber two-piece load permit and a night permit for timber with a 12 ft rear overhang.

  2. Utilities

    Monthly pole blanket

    Poles up to 120 ft long with 40 ft of overhang, on a blanket renewed by the month.

  3. Farm

    Hay and agriculture permits

    A hay blanket for loads up to 10 ft 6 in wide, and a special permit for agriculture vehicles on the interstate.

  4. Long freight

    Box van and overlength blankets

    Blanket permits for 57 ft box vans and a 99 ft overlength blanket.

How it works

Your Mississippi permit in three steps

  1. Send the load and route

    Truck, trailer, dimensions, weight, origin and destination. Your fleet details are saved for next time.

  2. We check and file

    Our permit desk checks the Mississippi rules for your load and files with MDOT Office of Enforcement.

  3. Get your permit

    You get the permit PDF, a written route and an interactive route map to share with the driver.

From our permit desk

What we check before filing in Mississippi

  1. The holiday stop starts the day before

    On the six holidays, permitted loads leave the road at noon the day before. We plan the run so the truck is parked by then.

  2. Night runs have a size cap

    Only loads up to 12 ft wide, 150,000 lbs or 99 ft long may move at night, and from 10 ft wide they need an escort. We tell you before booking whether your load qualifies.

  3. IFTA comes first

    MDOT issues an oversize permit only when the carrier's IFTA is current. We check it before the request goes in.

FAQ

Mississippi oversize permit questions

At what dimensions does Mississippi require an MDOT permit?

Over 8 ft 6 in wide, 13 ft 6 in high, 99 ft long or 80,000 lbs, with a trailer over 53 ft, or over the axle limits of 20,000 lbs single and 34,000 lbs tandem. A front projection of more than 3 ft needs a permit too.

How much does a Mississippi oversize permit cost?

It depends on the permit type, size, weight and route, and superloads cost more. Put your route into our permit cost calculator for an estimate, or send us the load and our permit desk quotes the exact price before filing.

How many days does a Mississippi single-trip permit give me?

Up to three consecutive days. Round-trip permits are available, and loads that move often within 14 ft wide, 14 ft high and 120 ft long can use the 365-day oversize blanket.

What is the difference between Red Line and Black Line highways in Mississippi?

Red Line highways allow up to 80,000 lbs. Black Line highways cap axle groups at 57,650 lbs, so a heavy load may need a different route.

Is a wide load allowed to travel after dark in Mississippi?

Only up to 12 ft wide, 150,000 lbs or 99 ft long. From 10 ft wide, a night move needs a front escort on two-lane roads and a rear escort on divided highways. Over 12 ft wide, travel runs from 30 minutes after sunrise to 30 minutes before sunset.

When does Mississippi call for a blue-light escort?

A police escort may be required from 18 ft wide. Superloads need two blue-light escorts from 160 ft long, from 15 ft 9 in high and at 300,000 lbs or more.

How does Route One GO get my Mississippi permit?

Send us the truck, trailer, load dimensions, axle weights and route. Our permit desk checks the Mississippi rules, files with MDOT in ExpressPass, and sends you the permit with a route map. Requests are taken 24/7.

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Send the details once. We file with MDOT Office of Enforcement, plus every other state on your route.

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