Maryland CDL Practice Test: General Knowledge (MD) 6

5 out of 5 (54 votes)
80% Passing score
50 Questions
10 Mistakes allowed
As a Maryland resident preparing for your CDL permit test in 2026, having the right resources at your fingertips is crucial. That's where our Maryland CDL General Knowledge Practice Test comes in! This is your sixth CDL practice test available on our site, designed to mirror the actual MVA permit test you'll face. With 50 carefully crafted questions, this CDL practice test is a comprehensive tool for assessing your knowledge and readiness. Our Maryland CDL practice test covers a wide array of topics essential for any aspiring commercial driver. From understanding the intricate details of your vehicle's equipment to managing emergencies on the road, this general knowledge test has it all. You'll find MVA test questions about pre-trip inspections, accident procedures, and even a few on hazardous materials. While you may not be seeking a HazMat endorsement right now, it's vital to be aware of these materials as a commercial driver. One of the unique aspects of our Maryland DMV general knowledge practice test is the inclusion of visual learning aids. We understand that many learners absorb information more effectively with visual cues. Therefore, our test includes images like road signs and traffic scenarios, enhancing your learning experience. The permit practice test adopts a multiple-choice and true/false format, exactly like the actual CDL permit test in 2026. This setup not only tests your knowledge but also hones your skills in identifying the correct answers through elimination. Furthermore, our Maryland CDL general knowledge practice test offers immediate feedback and detailed explanations for each question. This feature is invaluable in understanding not just what the correct answer is, but why it's correct. Such insights are crucial in deepening your understanding and ensuring that you're not just memorizing answers, but truly comprehending the material. So, dive into our Maryland CDL General Knowledge Practice Test. It's more than just a test; it's a comprehensive learning tool designed to boost your confidence and knowledge, steering you towards success in your actual DMV CDL test in 2026!
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Sample Maryland CDL Test Questions - General Knowledge

Question 1

Which practice is unsafe when backing toward a loading dock?

  1. A Back toward the driver’s side when possible
  2. B Use a visible helper and agreed hand signals
  3. C Continue backing until the vehicle strikes the dock

Correct answer: C – Continue backing until the vehicle strikes the dock

Backing should be performed slowly so steering errors can be corrected and the vehicle can be stopped promptly. When possible, back toward the driver’s side and use a helper with agreed signals. The driver should inspect the path before moving and get out to check whenever uncertain rather than intentionally continuing until the vehicle makes contact with the dock.

Source: Maryland Commercial Driver’s License Manual — § 2.2.4, “Backing Safely”

Question 2

What does the term “black ice” mean?

  1. A Hot roadway tar that has become slippery
  2. B A dark oil spill on the pavement
  3. C Compacted snow covering the road
  4. D A thin, clear layer of ice through which the roadway remains visible

Correct answer: D – A thin, clear layer of ice through which the roadway remains visible

Black ice is a thin layer of clear ice that allows the pavement beneath it to remain visible. Because it often looks like an ordinary wet surface, it can be difficult to detect. When the temperature is below freezing and the road appears wet, watch for black ice and reduce speed appropriately for the loss of traction.

Source: Maryland Commercial Driver’s License Manual — § 2.6.2, “Matching Speed to the Road Surface—Black Ice”

Question 3

Which conditions are tire problems that should be identified during an inspection?

  1. A Overinflation or underinflation
  2. B Severe wear or tread separation
  3. C Cuts, cracks, or other damage
  4. D All of these

Correct answer: D – All of these

Commercial-vehicle tires should be inspected for incorrect air pressure, excessive or uneven wear, exposed fabric, cuts, valve-stem damage, and tread separation. Other problems include mismatched tire sizes, dual tires touching each other, and improper mixing of radial and bias-ply tires. Any of the conditions listed in the choices can affect tire safety and vehicle control.

Source: Maryland Commercial Driver’s License Manual — § 2.1.3, “What Should You Look For?—Tire Problems”

Question 4

Which statement correctly describes a rear drive-wheel braking skid?

  1. A A trailer may push the towing vehicle sideways into a jackknife
  2. B Locked drive wheels have more traction than rolling wheels
  3. C This type of skid cannot cause a jackknife
  4. D Only the front wheels slide sideways

Correct answer: A – A trailer may push the towing vehicle sideways into a jackknife

A rear drive-wheel braking skid occurs when the rear drive wheels lock. Locked wheels generally have less traction than rolling wheels, causing the rear of the vehicle to slide sideways. On a straight truck or bus, this can produce a spinout. When towing a trailer, the trailer may push the power unit sideways and cause a sudden jackknife.

Source: Maryland Commercial Driver’s License Manual — § 2.19.1, “Drive-Wheel Skids”

Question 5

In Maryland, a funeral procession is continuing through a signal with the right-of-way. When may a vehicle outside the procession enter the intersection?

  1. A Whenever the outside vehicle has a green signal
  2. B Whenever there is a gap between two procession vehicles
  3. C After the first procession vehicle clears the intersection
  4. D Only when it can proceed without crossing the procession’s path

Correct answer: D – Only when it can proceed without crossing the procession’s path

When a qualifying funeral procession continues through a red signal, a vehicle outside the procession may not enter the intersection if it would cross the procession’s path. Even after the outside vehicle’s signal turns green, the procession retains the right-of-way. The procession’s signal privileges apply when the first vehicle entered before the light changed and participating vehicles display the required lights.

Source: Maryland Driver’s Manual — § 5.K, “Funeral Processions”, Md. Code, Transp. § 21-207(a)–(c)

Question 6

What are the two functions of a combination vehicle’s emergency air line?

  1. A It supplies air to the trailer air tanks
  2. B It controls the trailer emergency brakes
  3. C It performs both functions
  4. D It performs neither function

Correct answer: C – It performs both functions

The emergency or supply line carries air to the trailer air tanks and controls the emergency brakes. If pressure is lost from this line, the trailer emergency brakes apply and the tractor protection valve closes. Emergency lines are commonly marked in red to distinguish them from the blue service line, which carries the braking signal from the controls.

Source: Maryland Commercial Driver’s License Manual — § 6.2.4, “Trailer Air-lines—Emergency Air-line”

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