NM CDL Endorsements & Knowledge Test Requirements

Obtaining a Commercial Driver License (CDL) in New Mexico involves meeting federal and state-specific knowledge and endorsement requirements to ensure you are qualified to handle various commercial vehicles safely and legally.

CDL Classes and Basic Knowledge Test

New Mexico offers CDL Classes A, B, and C, with each class requiring a General Knowledge Test covering vehicle inspection, basic control, and safe driving practices. You must pass this test before taking any endorsement exams or scheduling a skills test.

Applicants must hold a New Mexico driver’s license, meet medical certification requirements, and clear all applicable federal background checks before testing. For detailed application steps, visit Applying for a New Mexico Commercial Driver License (CDL).

CDL Endorsements in New Mexico

Endorsements allow CDL holders to operate specialized vehicles or transport specific types of cargo. Available endorsements in New Mexico include:

• T (Double/Triple Trailers): Requires an additional knowledge test.
• P (Passenger Transport): Requires a knowledge and skills test with a vehicle designed to carry passengers.
• N (Tank Vehicles): Requires a tank vehicle knowledge test.
• H (Hazardous Materials): Requires a TSA background check and a Hazmat knowledge test.
• S (School Bus): Requires a P endorsement, school bus-specific knowledge test, and a driving skills test.
• X (Combination of Tank and Hazmat): Requires both tank and hazmat knowledge tests.

The specific test for each endorsement will assess your understanding of additional safety and regulatory procedures needed to operate these vehicle types.

Knowledge Test Structure and Passing Criteria

• The General Knowledge Test consists of 50 questions; you need at least 80% to pass.
• Each endorsement test ranges between 20-30 questions depending on the endorsement.
• Tests are available in English and Spanish.
• If you fail, you may retake after waiting at least one day, but repeated failures may require additional fees.

Preparing for the NM CDL Knowledge Tests

Study the New Mexico Commercial Driver’s Manual and take practice exams to increase your chances of passing. You can review the New Mexico Driver’s Manual Download & Overview for updated manuals aligned with state testing standards.

For those focusing on test readiness, review NM Written Permit Test Tips & Sample Questions to improve your knowledge retention.

Medical and Renewal Considerations

CDL holders in New Mexico are required to maintain a valid medical certificate and submit self-certification to the Motor Vehicle Division (MVD). Renewals involve medical updates and, in some cases, re-taking certain tests depending on your endorsement and medical conditions. For further details, see CDL Renewal & Medical Requirements in New Mexico.

Where to Take Your CDL Tests in New Mexico

Knowledge and skills tests can be scheduled at various MVD field offices across the state. For locations near you, check Locations of New Mexico DMV Field Offices by County. Skills tests for CDL are by appointment only and require a vehicle of the appropriate class for testing.

For current testing fees, schedules, and additional application forms, refer to the NM CDL Testing & Application Form Requirements page.

Additional Resources

For official details on CDL endorsements, knowledge tests, and federal requirements, visit the FMCSA CDL section and the New Mexico MVD CDL page.

A clear understanding of endorsement and knowledge test requirements will ensure you are prepared to operate safely and legally with your New Mexico CDL.