Louisiana is defined by its ports, petrochemical industry, and challenging infrastructure. The Port of New Orleans and the Port of South Louisiana, located along the Mississippi River corridor, collectively handle more cargo tonnage than any other port complex in the Western Hemisphere, generating enormous volumes of drayage freight. I-10, I-20, I-49, and I-55 form the state's Interstate spine, but Louisiana's highway system is also marked by elevated structures, coastal marshes, and bayou crossings that impose unique weight and load restrictions. The Louisiana Department of Transportation and Development (DOTD) issues oversize/overweight permits and sets highway standards. The Louisiana Office of Motor Vehicles (OMV) handles vehicle registration and the Louisiana Department of Revenue administers IFTA. Commercial enforcement is carried out by the Louisiana State Police and the DOTD. Petrochemical and oilfield hauling is a major specialized freight segment, with refineries and chemical plants along the Mississippi River corridor requiring heavy-haul and oversized load movements. Coastal and marsh routes serving oilfield operations are subject to seasonal weight restrictions based on road conditions, and carriers should verify route-specific limits before dispatch.
| GVWR | 80,000 lbs federal interstate standard |
| Single axle | 20,000 lbs |
| Tandem axle | 34,000 lbs |
Many Louisiana coastal, marsh, and elevated-structure routes have lower posted weight limits. Overweight permits available from DOTD for non-standard loads. Oilfield carriers must verify route-specific bridge and road ratings.
State trucking association: Louisiana Motor Transport Association
The Port of New Orleans and Port of South Louisiana together form one of the world's highest-volume port complexes. Drayage carriers must pre-register with individual terminals, comply with TWIC card requirements for port access, and navigate local truck routes through New Orleans and the River Road industrial corridor.
Many Louisiana routes serving coastal areas, bayous, and oilfield regions run on soft ground or over older elevated structures with lower weight ratings than Interstate bridges. DOTD posts route-specific weight limits, and carriers — especially those hauling oilfield equipment — must verify the limits for their specific route before dispatch.
Louisiana DOTD issues oversize/overweight permits through its permit office. Oilfield and petrochemical heavy-haul moves often require engineering review and may need special routing approval. Pilot car requirements apply to loads exceeding certain dimensions.
IFTA is administered by the Louisiana Department of Revenue. IRP apportioned registration is handled through the Louisiana Office of Motor Vehicles (OMV). Both require separate registrations and credentials for Louisiana-based carriers.