PermitPal

New Mexico CDL Practice Test

10 New Mexico-specific questions + General Knowledge · Updated July 12, 2026

The New Mexico CDL General Knowledge test runs 50 questions at the federal 80% standard (miss up to 10). New Mexico administers the CDL knowledge test in English only (as most states now do). This practice set leads with 10 questions specific to New Mexico — the state licensing rules (CLP validity, fees, intrastate age) that generic CDL prep skips — then fills with General Knowledge from the federally standardized material.

50Gen. Knowledge Q
25Air Brakes Q
20Combination Q
80%To pass each

New Mexico's real CDL exam sections. Also take the Air Brakes and Combination Vehicles practice tests.

Answer each question to see the explanation. Your score is tallied against the real passing bar at the end.

1. Before you can apply for a New Mexico Commercial Learner’s Permit (CLP), you must already hold:

Show answer & explanation

Correct answer: A valid New Mexico driver’s license

Chapter 5 lists the CLP prerequisites (§66-5-62): the applicant must have a valid New Mexico driver’s license, plus proof of Social Security number, identity/lawful presence, a DOT Medical Examiner’s Certificate, and two proofs of New Mexico physical residency.

2. How long is a New Mexico Commercial Learner’s Permit (CLP) valid?

Show answer & explanation

Correct answer: One year

Chapter 5 states the CLP "is issued for 1 year." You must obtain your CDL before the CLP expires, and you must retake all required knowledge tests for every CLP renewal.

3. After your CLP is issued, how soon may you take the CDL skills (road) test?

Show answer & explanation

Correct answer: Not until at least 14 days after the CLP is first issued

Chapter 5: "The CLP holder is not eligible to take the CDL skills test in the first 14 days after initial issuance of the CLP." This 14-day hold matches the federal floor in 49 CFR 383.25(e).

4. A New Mexico applicant who is 18 to 20 years old may be issued a CDL, but only with which restriction?

Show answer & explanation

Correct answer: A "K" restriction — intrastate commerce only, within New Mexico

Chapter 5: an applicant who is 18-20 "may apply for a CDL with a ‘K’ restriction, limiting the driver to intrastate commerce only." Interstate operation requires age 21 (49 CFR 391.11).

5. To transport hazardous materials that require a vehicle placard, a New Mexico driver must be at least:

Show answer & explanation

Correct answer: 21 — whether driving intrastate or interstate

Chapter 5: "to transport hazardous materials that require a vehicle placard, the driver must be at least 21 whether driving intrastate or interstate." The 18-20 intrastate "K" allowance does not extend to placarded hazmat.

6. A first-time Class A or Class B applicant in New Mexico must complete which step before a skills test can be scheduled?

Show answer & explanation

Correct answer: Entry-Level Driver Training (ELDT) from a registered Training Provider Registry provider

Chapter 5: all first-time CLP applicants on or after February 7, 2022 must complete federal Entry-Level Driver Training (49 CFR 380.600-603) — theory plus behind-the-wheel range and road training — from a listed provider before any skills test can be scheduled.

7. What score must you reach to pass each New Mexico CDL knowledge exam?

Show answer & explanation

Correct answer: At least 80%

Chapter 5: "An applicant must score at least 80% to pass each exam." This is the federal pass mark (49 CFR 383.135) and applies to General Knowledge, Air Brakes, Combination, and every endorsement test.

8. How often may you attempt a New Mexico CDL knowledge test?

Show answer & explanation

Correct answer: Up to twice a week — the system blocks you after two failed tests in a 7-day period

Chapter 5: "An applicant may take any CDL knowledge test up to two times per week." The system stops an applicant who has already taken and failed 2 tests in the 7-day period prior to and including the current day.

9. When you renew your New Mexico CLP or add an endorsement to it, you must:

Show answer & explanation

Correct answer: Retake all knowledge tests required for the permit you want

Chapter 5: "Applicant must retake all knowledge tests required for the CLP they want for every renewal or adding on any endorsements." A CLP renewal is treated like a fresh testing cycle.

10. Which endorsement can NEVER be issued on a New Mexico Commercial Learner’s Permit?

Show answer & explanation

Correct answer: Hazardous Materials (H)

Chapter 5: "A CLP cannot be issued with a Hazmat endorsement." The only endorsements allowed on a CLP are Passenger (P), School Bus (S), and Tank vehicle (N) — and a CLP tank endorsement carries an "X" (no cargo) restriction.

11. If a first major offense happens while you are operating a CMV placarded for hazardous materials, you lose your CDL for at least:

Show answer & explanation

Correct answer: 3 years

The one-year disqualification for a first major offense is extended to at least three years if the offense occurs while operating a CMV placarded for hazardous materials.

12. What is the disqualification for a second major offense?

Show answer & explanation

Correct answer: Loss of your CDL for life

A second major offense disqualifies you from holding a CDL for life. (A lifetime disqualification may be reduced under limited conditions set by the state.)

13. By operating a commercial motor vehicle, what have you agreed to under implied-consent rules?

Show answer & explanation

Correct answer: To submit to alcohol testing

If you operate a CMV, you are deemed to have given consent to alcohol testing. Refusing the test is itself a major offense carrying a one-year disqualification.

14. How does committing two serious traffic violations in a CMV within three years affect your CDL?

Show answer & explanation

Correct answer: You lose your CDL for at least 60 days

Two serious traffic violations in a CMV within a three-year period disqualify you for at least 60 days. A third within three years raises it to at least 120 days.

15. Which of these counts as a "serious traffic violation" for a CDL holder?

Show answer & explanation

Correct answer: Excessive speeding — 15 mph or more over the posted limit

Serious traffic violations include excessive speeding (15+ mph over the limit), reckless driving, improper or erratic lane changes, and following too closely. Parking violations do not count.

16. To drive a CMV, a driver must generally be:

Show answer & explanation

Correct answer: Medically certified as physically qualified

Drivers must be medically certified as physically qualified under the federal standards and, when required, carry the medical examiner’s certificate.

17. What happens if you take your skills test in a vehicle without air brakes, or fail the air brakes knowledge test?

Show answer & explanation

Correct answer: You receive a restriction barring you from driving a CMV equipped with air brakes

If you fail the air brakes knowledge test or take the skills test in a vehicle without air brakes, your CDL carries a restriction (the "L" code) prohibiting you from operating a CMV with air brakes.

18. What is the consequence of failing the combination vehicles portion of the CDL test?

Show answer & explanation

Correct answer: You cannot be issued a Group A (Class A) CDL

Failing the combination vehicles portion means you cannot receive a Group A (Class A) CDL — which is why combination knowledge is the gate to driving tractor-trailers.

19. Under federal Entry-Level Driver Training (ELDT) rules, first-time applicants for a Class A or B CDL must:

Show answer & explanation

Correct answer: Complete ELDT from a registered provider before taking the CDL skills test

Since the ELDT compliance date of February 7, 2022, first-time Class A/B applicants (and those upgrading or seeking an H, P, or S endorsement) must complete training from an FMCSA-registered provider before testing.

20. How many driver licenses may a CDL holder have?

Show answer & explanation

Correct answer: Only one license

You may hold only one license. Breaking this rule can lead to a court fine of up to $5,000 or jail, and all states share a computerized system to detect drivers with more than one CDL.

📱 PermitPal in your browser has the full 356-question CDL bank plus New Mexico's state unit — mock exams in all three real sections (General Knowledge, Air Brakes, Combination) at the federal 80% standard. Free to start, $29.99 once. Also on the App Store and Google Play.