1. During the walk-around inspection of a CMV, what wheel or rim condition would require immediate correction before the vehicle can be safely operated?

2. When inspecting the suspension system during a pre-trip inspection, which condition of the spring hangers would indicate an out-of-service condition requiring immediate correction?

3. During a pre-trip inspection, the driver checks the U-bolts on the suspension system. Which U-bolt condition would require immediate correction before the vehicle can be operated?

4. 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?

5. When checking spare electrical fuses during the cab inspection, what is the regulatory requirement for the quantity of spare fuses a CMV must carry?

6. During the cab check portion of a pre-trip inspection, what must the driver verify about the horn to ensure the vehicle meets safety requirements?

7. During a pre-trip inspection, the driver verifies that three reflective emergency triangles are present in the cab. When must these triangles be placed around the vehicle, and what is the correct placement pattern on a two-lane road?

8. A driver is performing a pre-trip inspection and discovers that two of the three required reflective triangles are present in the cab, but one triangle is missing. Later during the trip, the vehicle experiences a mechanical breakdown on a divided highway (four lanes, two directions). Which statement correctly describes the regulatory compliance and safety implications?

9. 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?

10. During the cab check portion of a pre-trip inspection, which of the following is NOT a required verification for emergency equipment compliance?

11. When starting a CMV engine, what should the driver verify regarding oil pressure?

12. According to FMCSA standards, within how many seconds should the air compressor build air pressure from 85 PSI to 100 PSI when the engine is at fast idle (approximately 1200-1500 RPM)?

13. At approximately what air pressure level should the low-pressure warning device activate in a CMV equipped with air brakes?

14. During the parking brake test portion of a pre-trip inspection, what procedure should the driver follow to verify the parking brake is functioning correctly?

15. What is the correct procedure for testing service brakes during the pre-trip inspection?

16. A driver starts a Class A tractor-semitrailer at 6:00 AM for a pre-trip inspection. The engine cranks and starts, but the oil pressure gauge remains at zero for 15 seconds before slowly rising to normal range. The driver notices this during the cab check. What action should the driver take?

17. A driver is performing an air brake system check on a combination vehicle. With the engine at fast idle, the air pressure gauge shows 85 PSI. After 50 seconds of watching, the pressure has only reached 92 PSI. The driver needs to determine whether this meets FMCSA standards. What conclusion should the driver reach?

18. A driver completes the air brake pre-trip inspection on a Class B straight truck. During the parking brake test, the driver applies the parking brake control and gently tugs the vehicle forward in low gear. The vehicle moves forward approximately 6 inches before the parking brake engages and holds. What should the driver conclude about this test result?

19. A driver is testing the air brake system during a pre-trip inspection on a tractor-semitrailer. With the engine running, the driver pumps the brake pedal to reduce air pressure and observe when the low-pressure warning activates. The warning light and buzzer activate at 55 PSI. The driver notes that FMCSA regulations state the warning must activate at “approximately 60 PSI.” Which analysis correctly evaluates whether this vehicle meets the standard?

20. A driver completes the service brake test by moving the vehicle forward at 5 MPH and applying the brakes. The vehicle stops, but the driver observes three issues: (1) the brake pedal went nearly to the floor, (2) the vehicle pulled slightly to the left, and (3) stopping took longer than expected. Which analysis correctly prioritizes these findings for defect reporting?

21. What is the correct sequence for conducting a systematic pre-trip inspection of a Class A combination vehicle?

22. Which lights and signals must be verified during the pre-trip inspection cab check with engine running?

23. When conducting an air brake leak test during the pre-trip inspection, what is the maximum acceptable air pressure loss per minute for a combination vehicle?

24. During the engine start portion of the pre-trip inspection, the driver must verify several systems immediately after starting the engine. Which of the following should the driver check within seconds of engine startup?

25. A driver discovers during the pre-trip inspection that the left rear brake drum shows visible cracks. What is the correct procedure for documenting and handling this defect?

26. A driver completes a pre-trip inspection and finds the following: oil pressure normal, all lights functional, air pressure builds correctly, parking brake holds, service brakes stop properly, but one rear tire shows 1/32 inch tread depth. The driver knows minimum tread depth for non-steer axle tires is 2/32 inch. What decision should the driver make regarding vehicle operation?

27. A driver testing service brakes during pre-trip inspection moves the vehicle forward at 5 MPH and applies the brakes. The vehicle pulls hard to the right during stopping, and the brake pedal feels firm without going to the floor. What should the driver conclude about this brake test result?

28. A driver performing a pre-trip inspection on a Class A tractor-semitrailer follows this sequence: starts the engine first, then checks oil pressure and belts, then does the walk-around, then checks the cab gauges, then inspects the trailer. Which step in this sequence is incorrectly ordered according to proper pre-trip procedures?

29. A driver performs a thorough pre-trip inspection and identifies three defects: (1) a cracked windshield that does not obstruct the driver’s forward vision, (2) one missing lug nut on a rear dual tire assembly with 9 remaining nuts, and (3) a slack adjuster showing 1.2 inches of push rod travel. Which analysis correctly determines whether this vehicle can legally be dispatched?

30. A driver discovers multiple defects during pre-trip inspection: low coolant level, one non-functional clearance light, and slack adjuster push rod travel of 0.9 inches. The driver prepares to document these findings on the DVIR. Which defect requires immediate repair before the vehicle can be dispatched, and which can be documented for later repair?

31. A driver is performing an in-route inspection and discovers that the alternator belt has more than 1/2 inch of play when pressed midway between pulleys. What should the driver do?

32. According to 49 CFR Section 396.17, what must be displayed on a commercial motor vehicle after passing an annual inspection?

33. When a commercial motor vehicle is placed out of service during a roadside inspection, what action must the driver take?

34. Which of the following brake conditions would place a commercial motor vehicle out of service according to CVSA criteria?

35. During a roadside inspection at a weigh station, the inspector asks the driver to operate the vehicle’s lights, horn, and windshield wipers for verification. The driver notices the windshield wipers leave streaks and miss sections of the windshield during operation. What is the driver’s responsibility in this situation?

36. A motor carrier receives a DVIR from a driver reporting that the left rear brake chamber shows visible cracks. The carrier schedules repairs for the following week and continues dispatching the vehicle. A roadside inspection places the vehicle out of service for the brake chamber defect. What record-keeping violation occurred?

37. A driver arrives at a weigh station for a roadside inspection. The inspection reveals that one of the steer axle tires has tread depth of 3/32 inch with exposed fabric cord visible on the shoulder. The inspector checks the CVSA Out-of-Service Criteria. What is the likely outcome of this inspection finding?

38. After a vehicle is placed out of service for defective brakes, the carrier arranges repairs and provides the driver with a repair invoice. Before resuming operation, what verification step must be completed?

39. A driver operating a Class A combination vehicle approaches a weigh station and receives an green light indicating bypass. Ten miles later, a state trooper activates lights behind the vehicle and requests a roadside inspection. The driver had not performed a detailed pre-trip inspection that morning due to time pressure. During the inspection, the trooper finds three defective lights and slack adjusters showing 1.25 inches of push rod travel. Which analysis best describes the regulatory failures in this situation?

40. All of the following are driver responsibilities during a roadside inspection, EXCEPT:

41. What color coding is used for the air supply lines connecting a tractor to a trailer?

42. What are glad hands and what is their purpose in a combination vehicle?

43. What does the trailer ABS malfunction lamp indicate when it remains illuminated during operation?

44. What is the primary function of the trailer breakaway valve in a combination vehicle’s air brake system?

45. After backing under a trailer and coupling, what test should the driver perform to verify the fifth wheel is properly locked around the kingpin?

46. A driver is conducting a pre-trip inspection on a tractor-semitrailer combination. During the trailer walk-around, the driver notices that one of the trailer’s dual tires on the rear axle has a visible bulge on the sidewall. The driver also notes that the matching dual tire appears to have lower tread depth than the bulging tire. What action should the driver take regarding this trailer tire condition?

47. A driver is coupling a tractor to a trailer and needs to connect the air lines. The driver sees a blue glad hand on one air line and a red glad hand on the other. The tractor has corresponding blue and red connectors. The driver connects the blue tractor glad hand to the red trailer glad hand and the red tractor glad hand to the blue trailer glad hand. What will happen when the driver tests the trailer brakes after this connection?

48. A driver begins a pre-trip inspection of a tractor-semitrailer at 5:30 AM. During the cab check, the driver observes that the trailer ABS malfunction lamp on the dash comes on briefly when the key is turned to the “on” position, then goes off. During the walk-around, the driver notices an ABS malfunction lamp on the trailer itself that is not illuminated. The driver is uncertain whether the trailer ABS system is functioning properly. What conclusion should the driver reach?

49. A driver needs to complete the coupling inspection for a Class A tractor-semitrailer. The following steps have been partially completed: (1) tractor positioned in front of trailer, (2) trailer air lines connected to tractor, (3) air supplied to trailer, (4) trailer brakes tested, (5) tractor backed under trailer until fifth wheel engaged. Which steps remain to be completed before the coupling inspection is finished?

50. A driver is inspecting a trailer breakaway valve during a pre-trip inspection. The valve appears intact with no visible damage. However, the driver observes that the emergency air line (red) from the tractor is connected but the valve’s pressure gauge shows only 45 PSI instead of the expected system pressure of approximately 120 PSI. The trailer spring brakes are currently released. Which analysis correctly identifies the most likely cause and appropriate response?