Maryland CDL Practice Test — General Knowledge, Air Brakes & Endorsements (2026)
Maryland's commercial driver license program requires passing a written knowledge test with a minimum score of 80%. Applicants must first obtain a Commercial Learner's Permit (CLP) for at least 14 days before taking the skills test. The CDL permit fee is $90 (which includes knowledge and skills testing fees). All CDL applicants must complete Entry-Level Driver Training (ELDT) before they can take the skills test. Maryland offers various CDL endorsements including hazmat, tanker, and passenger vehicle certifications. If you fail your first attempt, you can test again the next day; subsequent failures require a 7-day waiting period.
Sample Maryland CDL Practice Test Questions & Official Manual Citations (2026)
Below are 4 real sample questions from our Maryland cdl practice test bank. Every question in PassMyDMV cites the exact page and rule in the official Maryland manual so you understand the law behind every answer:
Sample Question 1 · Rollover Prevention
Official Maryland Manual · Chapter 10 · Page 200
What is the primary risk when pulling double or triple trailers at highway speeds?
- A. Increased fuel consumption
- B. Increased brake wear
- C. Greater instability and likelihood of rollover Correct
- D. Difficulty seeing in mirrors
Why C. Greater instability and likelihood of rollover is correct: Double and triple trailers have significantly less stability than single-vehicle combinations due to their extended length and higher center of gravity. The manual states that extra trailers make the vehicle less stable and more likely to rollover, requiring slower speeds on curves and careful steering. [Manual: Section 7: Doubles and Triples — Pulling Double/Triple Trailers, p. 200]
Manual excerpt (Official Maryland Manual · Chapter 10 · Page 200): “The extra trailers make your vehicle less stable and more likely to rollover.”
Sample Question 2 · Curve Speed
Official Maryland Manual · Chapter 10 · Page 200
At what speed should you take a highway curve when pulling doubles compared to a single trailer?
- A. The same posted speed limit
- B. Faster to maintain momentum
- C. Significantly slower than a straight truck or single trailer would need Correct
- D. At whatever speed the lead vehicle sets
Why C. Significantly slower than a straight truck or single trailer would need is correct: A safe speed on a curve for a straight truck or single trailer may be far too fast for doubles or triples. You must steer gently and go slowly around corners, ramps, and curves to prevent rollover. [Manual: Section 7: Doubles and Triples — Prevent Your Trailer from Rolling Over, p. 200]
Manual excerpt (Official Maryland Manual · Chapter 10 · Page 200): “A safe speed on a curve for a straight truck or a single trailer combination vehicle may be too fast for a set of doubles or triples.”
Sample Question 3 · Crack Whip Effect
Official Maryland Manual · Chapter 10 · Page 200
Which trailer in a double or triple combination is most likely to turn over?
- A. The middle trailer in a triple
- B. The first trailer behind the tractor
- C. The last (rear) trailer Correct
- D. All trailers equally
Why C. The last (rear) trailer is correct: Because of the crack-the-whip effect, the last trailer in a combination is the most likely to turn over. This whipping motion is more pronounced at the end of the unit, making the rear trailer most vulnerable to rollover. [Manual: Section 7: Doubles and Triples — Beware of the Crack-the-Whip Effect, p. 200]
Manual excerpt (Official Maryland Manual · Chapter 10 · Page 200): “The last trailer in a combination is the trailer most likely to turn over.”
Sample Question 4 · Look Ahead
Official Maryland Manual · Chapter 10 · Page 201
How far ahead should you look when driving doubles or triples compared to single vehicles?
- A. Only 50 feet ahead
- B. Further ahead than you would while driving a single vehicle Correct
- C. The same distance
- D. About twice as far
Why B. Further ahead than you would while driving a single vehicle is correct: Looking further ahead when driving doubles and triples allows you to slow down and change lanes safely, which is critical for avoiding rollover and jackknife situations with longer vehicle combinations. [Manual: Section 7: Doubles and Triples — Look Far Ahead, p. 201]
Manual excerpt (Official Maryland Manual · Chapter 10 · Page 201): “Look further ahead than you would while driving a single vehicle so you can slow down and change lanes safely.”
Most-Tested Maryland CDL Practice Test Topics in Our 788-Question Bank
Our Maryland cdl practice test bank contains 788 active multiple-choice questions written directly from the official Maryland handbook. Here is how those questions break down across the core exam topics:
Frequently Asked Questions: Maryland CDL Practice Test
All Maryland DMV Practice Tests & Study Guides
- Maryland DMV Practice Test Hub (Car, Motorcycle & CDL overview)
- Maryland Car Learner’s Permit Practice Test (872 questions)
- Maryland Motorcycle Permit Practice Test (342 questions)
- Maryland CDL Commercial Practice Test (788 questions)
- Maryland Road Signs & Traffic Signals Practice Test (286 questions)
- Official Maryland Driver Manual Table of Contents & PDF Handbook
- How to Get Your Maryland Driver License: 2026 Step-by-Step Guide
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