Colorado CDL Class B Practice Test (CO) 3

4.9 out of 5 (134 votes)
80% Passing score
20 Questions
4 Mistakes allowed
If you're gearing up for the Colorado CDL Class B test, our third CDL practice test is the perfect resource to get you ready. Featuring 20 questions, this test is crafted to mirror the real-world challenges of a Class B CDL applicant. To pass, you'll need to correctly answer at least 16 questions, setting a high bar for knowledge and preparation. Our Colorado CDL practice test is a comprehensive guide covering a multitude of topics crucial for any aspiring commercial driver. You'll find questions ranging from pre-trip vehicle inspection to the nuances of shifting gears, including downshifting techniques. This Colorado CDL class B practice test also dives into more complex scenarios like navigating hills and steep downgrades, effective communication with other road users, speed control, and the critical topic of drug and alcohol awareness. One of the greatest strengths of our online practice tests is their accessibility. Whether you're on a desktop, a tablet, or a mobile device, you can access these tests anytime, anywhere. This flexibility ensures that you can practice in a way that fits your schedule and learning style. Unlike the actual CDL written test, our practice version isn't timed. This allows you to delve deeply into each question, understanding the nuances without the pressure of a ticking clock. It's an approach that differs from the real Colorado CDL permit test's time constraints but provides a more enriching and stress-free learning experience. Remember, the set of questions remains consistent each time you take the test, allowing you to track your progress and focus on areas that need improvement. With questions closely resembling those on the actual test, both in format and content, this Colorado CDL general knowledge practice test is an invaluable tool in your preparation arsenal. Get ready to ace that Colorado CDL Class B exam!
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Sample Colorado CDL Test Questions - General Knowledge

Question 1

Which statement about containerized freight is correct?

  1. A It is exempt from hazardous-materials requirements
  2. B It is exempt from vehicle weight limits
  3. C It is commonly used when freight travels part of the journey by rail or ship
  4. D It never requires securement to the vehicle

Correct answer: C – It is commonly used when freight travels part of the journey by rail or ship

Containerized loads are generally used when freight is carried for part of its journey by rail or ship, with truck transportation at the beginning or end. Some containers lock directly to a special frame, while others are carried on flatbed trailers. A container must still be properly secured, and its packaging does not create exemptions from other applicable requirements.

Source: Colorado Commercial Driver License Manual — § 3.3.5, “Sealed and Containerized Loads”

Question 2

Which of the following should a commercial driver recognize as a potential traffic hazard?

  1. A A delivery vehicle that may block sight lines or enter traffic
  2. B A stopped school bus with passengers nearby
  3. C A disabled vehicle and people working beside it
  4. D All of the above

Correct answer: D – All of the above

Each situation can develop into a conflict requiring the driver to slow, stop, or change position. Delivery vehicles may obstruct vision or enter traffic unexpectedly, bus passengers may cross nearby, and people around disabled vehicles may be close to moving traffic. Early hazard recognition provides more time to respond safely.

Source: Colorado Commercial Driver License Manual — §§ 2.8.1, 2.8.3, “Importance of Seeing Hazards” and “Drivers Who Are Hazards”

Question 3

What are the two air lines found between the units of a combination vehicle?

  1. A Service and emergency
  2. B Service and brake
  3. C Brake and emergency
  4. D Brake and pressure

Correct answer: A – Service and emergency

Every air-braked combination vehicle has a service line and an emergency line. The service line, also called the control or signal line, controls normal trailer-brake application. The emergency line, also called the supply line, fills the trailer air tanks and controls the emergency brakes if pressure is lost.

Source: Colorado Commercial Driver License Manual — § 6.2.4, “Trailer Air-lines”

Question 4

Which action is part of monitoring the vehicle’s condition while it is moving?

  1. A Removing the radiator cap to inspect coolant
  2. B Opening the brake-fluid reservoir
  3. C Watching the gauges for indications of trouble
  4. D Disconnecting the trailer electrical connection for testing

Correct answer: C – Watching the gauges for indications of trouble

The Colorado Commercial Driver License Manual directs drivers to watch the gauges for signs of trouble during a trip. Drivers should also use sight, hearing, smell, and feel to identify possible problems. Tires, wheels, brakes, lights, trailer connections, coupling devices, and cargo securement should be checked when the vehicle is safely stopped.

Source: Colorado Commercial Driver License Manual — § 2.1.2, “Types of Vehicle Inspection—During a Trip”

Question 5

A commercial vehicle is stopped on a straight, level, two-lane road carrying traffic in both directions. How should its three warning triangles be placed?

  1. A One within 10 feet of the vehicle, one about 100 feet ahead, and one about 100 feet behind
  2. B One within 10 feet behind, one 100 feet behind, and one 200 feet behind
  3. C One 50 feet behind, one 100 feet behind, and one within 10 feet ahead
  4. D All three within 100 feet behind the vehicle

Correct answer: A – One within 10 feet of the vehicle, one about 100 feet ahead, and one about 100 feet behind

On a two-lane roadway carrying traffic in both directions, one warning device marks the vehicle within 10 feet of its front or rear corner. The other devices are placed approximately 100 feet ahead and 100 feet behind. They should be positioned on the shoulder or in the lane where the vehicle stopped.

Source: Colorado Commercial Driver License Manual — § 2.5.2, “When Parked at the Side of the Road”, 49 CFR § 392.22(b)(1) — Emergency Signals; Stopped Commercial Motor Vehicles

Question 6

If vehicle speed is doubled, approximately how much longer does the braking distance become?

  1. A Two times longer
  2. B Four times longer

Correct answer: B – Four times longer

Doubling speed makes the braking distance approximately four times as long under comparable conditions. For example, increasing speed from 20 to 40 mph quadruples both braking distance and impact force. Total stopping distance also includes perception and reaction distance, but the four-times principle specifically describes braking distance.

Source: Colorado Commercial Driver License Manual — § 2.6.1, “The Effect of Speed on Stopping Distance”

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