What Are Overdimension Permits in New Mexico?
In New Mexico, overdimension permits are required for commercial vehicles that exceed the state’s legal size or weight limits. These permits ensure safe operation on public highways and proper protection of roads, bridges, and infrastructure. The New Mexico Department of Transportation (NMDOT) issues permits for carriers moving oversize or overweight loads.
There are two main types of overdimension permits: oversize permits and overweight permits.
What Is an Oversize Permit?
An oversize permit is needed when a vehicle or load exceeds New Mexico’s legal dimension limits, even if the weight is within legal limits.
Typical oversize limits in New Mexico include:
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Width over 8 feet 6 inches
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Height over 14 feet
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Length over 65 feet (for most combination vehicles)
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Excessive front or rear overhang beyond standard limits
Oversize permits focus on vehicle dimensions and how the load interacts with traffic, bridges, tunnels, and overhead structures.
What Is an Overweight Permit?
An overweight permit is required when a vehicle or load exceeds New Mexico’s legal weight limits, regardless of physical dimensions.
Common overweight conditions include:
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Gross vehicle weight over 80,000 pounds
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Axle or axle-group weights exceeding state limits
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Loads that require special route planning to protect highways and bridges
Overweight permits primarily address road and bridge protection.
When Are Both Permits Required?
Certain loads exceed both weight and dimension limits, requiring carriers to obtain both oversize and overweight permits. Examples include:
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Large construction equipment
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Industrial machinery
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Prefabricated buildings or modular units
NMDOT may require route surveys, escort vehicles, or travel restrictions for these loads.
Key Differences Between Oversize and Overweight Permits
| Feature | Oversize Permit | Overweight Permit |
|---|---|---|
| Focus | Dimensions | Weight |
| Typical Limits | Width, height, length | Axle & gross weight |
| Main Concern | Clearance, traffic safety | Road and bridge integrity |
| Escort Required | Often | Sometimes |
| Fees Based On | Size and distance | Weight and distance |
Permit Types in New Mexico
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Single-Trip Permits: For one-time moves
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Annual Permits: For frequent or repetitive loads within set limits
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Special or Superload Permits: For extremely large or heavy loads
Permit selection depends on vehicle configuration, load type, and travel frequency.
You can apply for overdimensional permits at https://www.newmexicotruckingonline.com/ or by calling to (505) 578-2195
Penalties for Non-Compliance
Operating without the required permit can result in:
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Fines and citations
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Vehicle impound or out-of-service orders
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Permit revocation
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Delays and increased transport costs
Key Takeaway
Understanding the difference between oversize and overweight permits in New Mexico helps carriers plan their routes, select the correct permits, and avoid penalties. Always confirm load dimensions and weight before applying through https://www.newmexicotruckingonline.com/.