1. During the cab check portion of a pre-trip inspection, the driver verifies the fire extinguisher. What is the requirement for the fire extinguisher to be considered properly maintained and ready for use?

2. What is “off-tracking” in the context of commercial motor vehicle operation?

3. A driver is preparing to start a loaded tractor-semitrailer on a steep downhill grade. The vehicle has a 10-speed manual transmission. Place the following steps in the correct sequence for a safe start:

1. Release parking brake
2. Shift transmission to first gear
3. Apply service brake pedal
4. Depress clutch pedal fully to engage clutch brake
5. Gradually release clutch while applying accelerator
6. Verify vehicle is secure and mirrors adjusted

4. What is the motor carrier’s responsibility when receiving a Driver Vehicle Inspection Report (DVIR) that lists vehicle defects?

5. A passenger vehicle is following your 65-foot combination vehicle too closely on a two-lane highway. What is the BEST action to handle this tailgater?

6. A CDL driver performs a pre-trip inspection on a Class A tractor-semitrailer and finds the following conditions: one wheel rim on the drive axle has a visible crack approximately 1 inch long, two U-bolts on the trailer axle appear loose (can be moved by hand), and the fire extinguisher gauge shows it is in the “discharged” zone. Which analysis correctly identifies the vehicle’s operational status?

7. A driver must back a loaded tractor-semitrailer into a dock located on a slight downgrade (2% slope) that the driver is approaching from above. The dock area has limited space. Which backing approach accounts for the downgrade most safely?

8. A driver’s ELD malfunctions during a trip and displays an error message. Under 49 CFR 395.34, what must the driver do?

9. At 55 mph on dry pavement, what is the approximate total stopping distance for a loaded commercial motor vehicle?

10. A flatbed driver has secured a cargo of dressed lumber (packaged boards) using the required tiedowns. The driver has traveled 35 miles from the loading location. What action must the driver take regarding cargo inspection?

11. A driver is approaching a construction zone on an interstate highway where traffic has slowed significantly. The driver needs to warn following traffic of the sudden slowdown ahead. Which communication device should be activated?

12. A driver is inspecting the air brake system air storage tanks during a pre-trip inspection. The driver opens the drain valve on a tank and observes that only a small amount of moisture drains out, followed by clear air. The driver then checks another tank and finds that the drain valve is stuck and cannot be opened. What should the driver determine and report about these tank drain valve conditions?

13. What is the maximum acceptable tilt angle for a fifth wheel during pre-trip inspection?

14. What is the primary mechanical difference between wedge brakes and S-cam brakes in an air brake foundation brake system?

15. A driver is navigating a 90-degree right turn from a two-lane road onto a narrow street. The combination vehicle is 70 feet long overall. The driver notices a fire hydrant positioned 4 feet from the curb on the corner of the destination street. Based on off-tracking principles, what should the driver do?

16. A driver performing a trailer pre-trip inspection on a Class A combination vehicle notices that the landing gear handle is missing, but the crank mechanism is accessible using a universal wrench. The landing gear legs appear fully raised and secured. What should the driver do regarding this defect?

17. A 60-foot combination vehicle is traveling at 55 mph on a dry highway. At this speed, perception distance is approximately 142 feet, reaction distance is approximately 61 feet, and braking distance is approximately 150 feet for a loaded CMV. What is the total stopping distance?

18. A driver loaded a 3-foot-long crate weighing 4,000 pounds and used one strap with a WLL of 1,500 pounds to secure it. The cargo shifted during transport, causing the strap to break. Which TWO regulatory violations contributed to this cargo securement failure?

19. A CDL driver has accumulated the following convictions within the past three years: (1) speeding 20 MPH over the limit in a CMV, (2) improper lane change in a personal vehicle, (3) following too closely in a CMV, (4) failing to stop at a railroad crossing in a CMV. Which analysis correctly determines whether this driver faces disqualification?

20. You are driving a loaded tractor-semitrailer on a mountain downgrade when you notice your brakes are beginning to fade—the brake pedal feels soft, and stopping power is reduced despite normal pedal pressure. You have been using the brakes frequently to control speed on the grade. What is the correct immediate response to brake fade on a downgrade?

21. A driver is calculating the minimum following distance for a 70-foot combination vehicle traveling at 60 mph on a dry interstate highway. Traffic ahead is moving at approximately 55 mph, creating a closing speed differential. The driver maintains 6 seconds of following distance. Analyze whether this following distance meets the minimum formula requirements and identify what adjustments should be made for the speed differential and potential adverse factors.

22. A driver transporting a load of logs on a flatbed trailer has secured the cargo using four stake pockets with stakes inserted, and has used chains wrapped around the log stack at multiple points. During the 50-mile cargo inspection, the driver notices one chain has loosened by approximately 2 inches. What specific requirements apply to log cargo securement under 49 CFR Part 393 Subpart J, and what action must the driver take?

23. A commercial driver is preparing to make a right turn in a city environment. According to proper turn signal timing, when should the driver activate the turn signal?

24. A driver needs to ensure adequate weight on the front axle of a tractor-semitrailer for safe operation. What is the primary reason front axle weight is critical for CMV safety?

25. You are driving a tractor-semitrailer in heavy fog on a highway. Visibility is reduced to approximately 200 feet. Other vehicles are traveling at reduced speeds, and you need to navigate safely through this condition. What is the correct headlight usage for driving in fog?

26. What organization publishes the North American Standard Out-of-Service Criteria that determines when a commercial motor vehicle cannot be legally operated?

27. You are driving a CMV with air brakes on a highway when you notice the air pressure gauge reading has dropped from 120 PSI to 95 PSI over the past 10 minutes without any heavy braking. The low-pressure warning light has not activated. What should you do?

28. What is the minimum tread depth required for steer axle tires on a commercial motor vehicle according to federal regulations?

29. While driving at night on an interstate highway, you notice an oncoming vehicle approaching in the opposite lane approximately 600 feet away. Your headlights are currently set to high beams. What should you do?

30. What is the FIRST step a driver must take when uncoupling a tractor from a trailer?

31. A driver is traveling on a rain-slicked highway at 50 MPH when a sudden braking situation occurs. The driver brakes firmly and feels the tractor beginning to slide sideways while the trailer continues pushing forward—a jackknife is starting. Which immediate action should the driver take to attempt recovery?

32. A driver operating a loaded tractor-semitrailer notices smoke coming from under the hood area and smells burning material. The driver pulls to the shoulder and stops. What is the correct sequence of actions for responding to a vehicle fire?

33. A driver completes a pre-trip inspection and discovers that the slack adjuster on the left front brake shows push rod travel of 1.5 inches. The driver documents this on the DVIR but decides to proceed with the trip because the carrier’s maintenance department is closed and cannot certify repairs until Monday. Which analysis correctly describes the regulatory and safety implications of this decision?

34. A driver with a Class B CDL is performing a pre-trip inspection on a straight truck with air brakes. Which inspection component would NOT be part of this Class B vehicle’s pre-trip procedure compared to a Class A combination vehicle inspection?

35. When making a right turn with a tractor-semitrailer, what is the correct procedure to prevent the trailer from off-tracking into the curb or adjacent lane?

36. During trailer coupling verification, a driver notices that the rubber seal inside the emergency (blue) glad hand connector is cracked and partially deteriorated. The seal is still present but shows visible wear. The driver connects the air lines and performs a visual check. What is the correct action for this condition?

37. When did the FMCSA ELD mandate become effective for most commercial motor vehicle drivers required to keep Records of Duty Status (RODS)?

38. How far ahead should a commercial driver look while driving at highway speeds to maintain adequate visual search and anticipate potential hazards?

39. A driver is approaching a 90-degree right turn in a residential area with parked cars along the curb. The driver operates a 65-foot tractor-semitrailer combination. Analyze the situation and determine which approach minimizes the risk of trailer off-tracking into the sidewalk area while avoiding conflict with oncoming traffic.

40. What is the primary reason commercial drivers should always back toward the driver’s side when possible?

41. A CDL driver receives an L restriction on their license. What does this restriction indicate, and how can it be removed?

42. A CDL applicant undergoes a DOT physical examination. The applicant’s uncorrected vision is measured at 20/60 in the right eye and 20/80 in the left eye. When wearing corrective lenses, the applicant’s vision improves to 20/40 in each eye. Based on 49 CFR Part 391 vision requirements, is this applicant medically qualified to operate a CMV?

43. During the walk-around inspection, what color are the rear clearance lamps and identification lamps required to be on a commercial motor vehicle?

44. A driver is approaching a tight right turn with a guardrail on the right side of the road. There is oncoming traffic in the opposite lane. The driver must decide how to execute this turn safely. Which analysis best describes the correct approach?

45. A driver couples a tractor to a semitrailer and performs the tug test. When pulling forward gently against the trailer brakes, the trailer moves forward several inches and the driver hears a clunk from the fifth wheel area. The driver stops, inspects the fifth wheel, and finds that the locking lever is not fully in the locked position. What is the most likely cause of this coupling failure, and what should the driver do?

46. What is the maximum acceptable air pressure drop during a static leak test with the engine off and parking brake applied for a single vehicle?

47. A driver needs to back a tractor-semitrailer into a dock located at the end of a narrow alley. The alley is approximately 12 feet wide with limited visibility on both sides. The dock entrance faces the alley directly. Analyze the situation and determine the safest backing approach.

48. A commercial driver is approaching a four-way intersection where their traffic light has just turned yellow. The intersection is clear, and the driver estimates they are 100 feet from the stop line traveling at 35 mph in a fully loaded truck. The driver knows they can stop safely. What should the driver do?

49. You are approaching a railroad crossing in a low-clearance CMV (vehicle bottom clearance of 8 inches). The crossing has a steep approach on both sides, and you observe that the tracks sit higher than the road surface. You are currently in a line of vehicles waiting to cross. Which statement BEST describes your space management concern at this crossing?

50. A driver is descending a long, steep grade with a fully loaded combination vehicle. The driver notices the brake pedal feels “spongy” and requires more pressure to achieve the same braking effect, even though the air pressure gauge shows normal pressure. The driver continues using the brakes heavily. What is happening, and what is the correct response?