Department of Transportation
MDOT
Mississippi • United States of America
The Mississippi Department of Transportation (MDOT) manages over 11,000 miles of state and US-route highways in a state that is a significant transit corridor for freight moving between the Midwest, Gulf Coast, and Southeast. Key corridors include I-20, I-55, I-59, I-10, and US-49. Mississippi's Gulf Coast ports and the Port of Gulfport are important export points for agricultural commodities and manufactured goods. MDOT administers commercial vehicle permits, manages weigh stations along major interstates, and provides the MdotTraffic.com portal for real-time road conditions. The department also oversees bridge weight limits critical for protecting aging rural infrastructure.
| Official Website | https://mdot.ms.gov/ |
|---|---|
| Data API | https://www.mdottraffic.com/ |
| Founded | 1916 |
| Headquarters | Jackson |
Available Data
Social Media
- @MississippiDOT — MDOT
Mississippi Trucking Regulations
Size & weight limits, OS/OW permits, and seasonal restrictions for commercial vehicles
Weight Limits
| Category | Limit |
|---|---|
| Max Gross Vehicle Weight | 80000 lbs |
| Single Axle | 20000 lbs |
| Tandem Axle | 34000 lbs |
Dimensional Limits
| Category | Limit |
|---|---|
| Max Height | 13.6 ft |
| Max Width | 8.5 ft |
| Max Length (Single Unit) | 40 ft |
| Max Length (Combination) | 65 ft |
OS/OW Permits
Weigh Station Bypass
18¢/gal
Member
Special Exemptions
Notable Rules
Mississippi has one of the lowest diesel fuel tax rates in the US. The Port of Gulfport and Port of Pascagoula serve Gulf Coast freight. I-20, I-55, and I-59 are primary freight corridors. Poultry and catfish processing industries generate significant rural freight. No spring weight restrictions due to warm Gulf climate.