---
title: Mississippi Oversize & Overweight Permits (OS/OW) | MDOT Superload | Alpine Truck Service
description: Expedited Mississippi MDOT oversize permits, Jackson curfews, Mississippi River bridge clearances, and MHP escorts across I-55 and I-20. Call (918) 607-6547.
image: https://www.alpinetruckservice.com/alpine-third-party-charges.webp
---

# Mississippi Oversize, Overweight & Superload Permitting Services

Comprehensive commercial trucking permits and heavy haul compliance across Mississippi.

## Agency & Permitting Authority
- **Agency**: Mississippi Department of Transportation (MDOT)
- **Portal**: MDOT Heavy Haul Permitting Portal
- **Regulatory Advisory**: State DOT regulations and permit processing queues are determined by individual state transportation authorities and vary by agency workload. Carriers should verify active route advisories and state requirements prior to movement.

## Legal vs. Routine Permitted Dimensions
- **Legal Width**: 8' 6" | **Max Routine**: 16' 0"
- **Legal Height**: 13' 6" | **Max Routine**: 15' 6"
- **Legal Length**: 53' Semi-Trailer / 65' Overall | **Max Routine**: 120' 0"
- **Legal Gross Weight**: 80,000 lbs (up to 84,000 lbs on designated harvest/state routes) | **Max Routine**: 150,000 lbs
- **Axle Limits**: Single: 20,000 lbs, Tandem: 34,000 lbs, Tridem: 42,000 lbs

## Permitting Scope & Services in Mississippi
- **Routine Oversize (OS) Cab-Cards**: Single-trip authorizations for dimensions exceeding 8' 6" width or 13' 6" height.
- **Overweight (OW) Axle Permits**: Overload cab-cards for heavy machinery and configurations exceeding 80,000 lbs GVW.
- **Multi-Axle Superload Permits**: Specialized filings exceeding Over 150,000, including State DOT and certified partner bridge reviews, route surveys, and police escorts.
- **Annual & Blanket Fleet Permits**: Continuous-operation annual highway authorizations for construction fleets.
- **Temporary Trip & Fuel Permits**: 72-hour IRP vehicle registration and IFTA fuel tax credentials.
- **County, City & Toll Road Clearances**: Municipal authorizations and turnpike clearances.

## Superload Permitting & State Review Protocol
- **Weight Trigger**: Over 150,000 lbs GVW or exceeding Bridge Formula structural capacities
- **Width Trigger**: Over 16' 0" wide
- **Height Trigger**: Over 15' 6" high
- **Length Trigger**: Over 120' 0" overall length
- **State & Partner Bridge Review**: Mississippi Department of Transportation (MDOT) electronic systems and certified structural engineering partners evaluate axle load distribution across bridge structures upon submission.
- **Route Surveys & Clearances**: Required for extreme heights/widths to verify overhead physical clearances.
- **Utility & Escorts**: Coordinated wire lifts with power utilities and State Police / Highway Patrol escorts.

## Pilot Cars & Escort Vehicle Requirements
- **Front Escort**: Required over 12' 0" wide on two-lane highways; over 14' 0" wide on multi-lane highways
- **Rear Escort**: Required over 14' 0" wide on multi-lane highways; length exceeding 90' 0"; rear overhang > 15' 0"
- **Height Pole**: Required for loads exceeding 15' 6" in height (lead vehicle with calibrated pole)
- **Police Escort**: Mississippi Highway Patrol (MHP) escort required over 16' 0" wide, 16' 0" high, or gross weight over 150,000 lbs

## Metro Curfews & Travel Restrictions
- **Curfew Zones**:
  - Jackson Metro Area (I-55, I-20, I-220): 7:00–8:30 AM & 4:30–6:00 PM M-F
  - Gulf Coast / Biloxi-Gulfport (I-10, US-90) during peak commute hours
- **Travel Rules**: Daylight only (1/2 hour before sunrise to 1/2 hour after sunset) Monday through Saturday. Sunday travel allowed until 12:00 noon for loads under 12' wide. Overweight-only continuous travel allowed with lighting.

## Key Freight Corridors
- I-55 (North-South Delta Spine)
- I-20 (East-West Trans-Mississippi)
- I-10 (Gulf Coast Corridor)
- I-59 (New Orleans to Meridian)
- US-49 (Gulfport to Jackson)
- US-78 / I-22 (Memphis to Birmingham)

## Frequently Asked Questions
### How fast does MDOT issue a Mississippi oversize permit?
MDOT processes routine single-trip permits within 2–4 business hours. Superloads requiring bridge calculations take 3–5 business days.

### What are Mississippi pilot car requirements for wide loads?
Mississippi requires 1 escort for loads over 12' wide on 2-lane roads and over 14' wide on multi-lane highways. Loads over 90' long require a rear escort.

### What are the Jackson rush hour curfews?
Oversize vehicles cannot travel on Jackson metropolitan interstates (I-55, I-20, I-220) between 7:00–8:30 AM and 4:30–6:00 PM on weekdays.

### What qualifies as a superload in Mississippi?
Shipments over 150,000 lbs gross weight, 16' wide, 15'6" high, or 120' long are classified as superloads in Mississippi.

## Contact & Direct Dispatch
- **Direct Phone**: (918) 607-6547 (CALL: [918-607-6547](tel:9186076547))
- **Email**: [permits@alpinetruck.com](mailto:permits@alpinetruck.com)
- **Online Intake**: [alpinetruckservice.com/permits/mississippi](https://www.alpinetruckservice.com/permits/mississippi)