1. A tractor-semitrailer rolls over while negotiating an interstate highway curve at 50 MPH. Investigation reveals the following: the cargo was palletized goods loaded to the full height of the trailer (high center of gravity), the curve had an advisory speed of 35 MPH, the driver entered the curve at 50 MPH and did not brake until mid-curve, and the road surface was dry. Which combination of factors contributed most directly to this rollover?

2. What is the minimum age requirement for a driver to obtain a CDL for interstate commerce?

3. A CDL skills test applicant completes the parallel parking (conventional) exercise with the vehicle fully within the boundary lines at the correct final position. During the maneuver, the applicant made four pull-ups (stopping and pulling forward to reposition) and two outside vehicle observations (looking in the direction of travel before movement). No boundary encroachments occurred. The applicant’s final position is correct. How should this exercise be scored under standard AAMVA criteria?

4. Which three pieces of emergency equipment are required to be present and properly maintained in every commercial motor vehicle during the cab check portion of a pre-trip inspection?

5. A CMV with air brakes is traveling at 55 MPH. The air brake lag time is approximately 0.5 seconds. Given that perception distance is approximately 150 feet and reaction distance is approximately 60 feet at this speed, what is the total distance the vehicle travels before the brakes actually begin to engage after the driver perceives a hazard and applies the brake pedal?

6. 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?

7. A driver is coupling a converter dolly to the first trailer in a doubles combination. The driver connects the glad hands and observes that air is flowing to the dolly brakes. Which glad hand color coding indicates the emergency (supply) line versus the service line?

8. 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?

9. What is the purpose of maintaining adequate space to the sides of a commercial motor vehicle, and which areas present the greatest risk due to limited visibility?

10. A CDL driver is preparing to make a left turn from a two-lane highway onto a side road. The driver activates the turn signal 500 feet before the turn and begins slowing. A following vehicle in a passenger car appears to be unaware of the upcoming turn and is closing the distance rapidly. The driver notices the vehicle entering the rear no-zone. Which analysis best describes the communication failure and what action should the driver take?

11. A CDL driver is operating a 65-foot tractor-semitrailer at 55 mph on an interstate during heavy rain. The standard following distance calculation would require approximately 7 seconds. However, visibility is reduced to approximately 400 feet due to rain spray. What adjusted following distance should the driver maintain?

12. What following distance rule should a tank vehicle driver follow compared to other CMVs of similar length?

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

14. A Class A tractor-semitrailer is stopped at a weigh station for a roadside inspection. The CVSA inspector checks the vehicle and places it out of service for three violations: (1) Left steer axle tire with tread depth of 2/32 inch, (2) Right rear drive axle slack adjuster with 1.5 inches of push rod travel, and (3) Inoperative left rear trailer brake light. The driver argues that the vehicle passed a pre-trip inspection that morning and was therefore safe to operate. Which analysis correctly identifies the regulatory implications of this situation?

15. What is the correct sequence for the first two steps when coupling a tractor to a trailer?

16. When backing a combination vehicle, which side is preferred for visibility and safety?

17. When backing a tractor-trailer, what is the relationship between steering wheel input and trailer movement direction?

18. During an engine-running air brake inspection, the driver observes that the air compressor builds pressure from 85 PSI to 100 PSI in 30 seconds at engine idle. What conclusion should the driver reach?

19. A loaded combination vehicle is traveling at 65 mph when the driver observes a hazard ahead requiring immediate stopping. The perception distance is 143 feet (1.1 seconds), reaction distance is 61 feet (0.65 seconds), and braking distance is estimated at 335 feet. The driver takes 2 seconds to perceive the hazard and 1 second to react. The total stopping distance achieved is 545 feet. Why does this exceed the ideal stopping distance, and what caused the difference?

20. You are driving on a two-lane road and need to pass a parked vehicle on your right side. There is oncoming traffic in the left lane. What is the safest action regarding space to the sides?

21. What is the primary purpose of the trailer hand valve (trolley valve) in a combination vehicle?

22. A driver has loaded palletized cargo onto a flatbed trailer and secured it with four tiedowns. During the cargo securement inspection within the first 50 miles of the trip, the driver notices that two tiedowns have loosened slightly and one strap shows minor abrasion from rubbing against a sharp cargo edge. What actions are required under 49 CFR Part 393?

23. You are driving a 60-foot straight truck through a construction zone with narrow lanes. Traffic in front of you stops suddenly, and you estimate you have approximately 250 feet of stopping distance available. Your current speed is 45 mph. Considering perception time (1.5 seconds) and reaction time (0.75 seconds), will you be able to stop safely?

24. At what air pressure level should the low-pressure warning device activate in a properly functioning air brake system?

25. What is the primary advantage of push-pull steering over hand-over-hand steering for commercial vehicles?

26. A motor carrier operates both property-carrying and passenger-carrying vehicles. A driver is assigned to drive a tour bus in the morning and a delivery truck in the afternoon. Which HOS rules apply?

27. A CMV driver approaches a railroad crossing marked with a crossbuck sign but no active warning devices (lights, gates). The tracks appear clear in both directions. The driver’s vehicle has a low undercarriage clearance. What analysis should guide the driver’s crossing decision?

28. A driver is operating a tank vehicle with a partially filled smooth bore tank carrying food-grade liquid. The driver needs to stop at a traffic light ahead. Which driving technique should the driver use to manage liquid surge safely?

29. A driver is descending a steep mountain grade with a loaded combination vehicle. The driver has been using the service brakes frequently to control speed. Suddenly, the driver notices the brakes feel “spongy” and require significantly more pedal travel to achieve the same braking effect. The air pressure gauge reads 95 PSI. What is happening, and what should the driver do immediately?

30. A driver needs to secure a 25-foot steel beam weighing 8,000 pounds on a flatbed trailer. The beam is placed on dunnage and is not blocked against forward movement. What is the minimum number of tiedowns required?

31. A CDL holder received a conviction for reckless driving in a CMV in January 2025. In March 2025, the driver received a second conviction for improper lane change while operating a CMV. What disqualification period does this driver face?

32. A driver is operating a 70-foot combination vehicle carrying 45,000 lbs of cargo on an interstate highway at 2:00 AM. Light rain is falling, and the temperature has dropped from 40°F to 32°F in the last 30 minutes. The driver notices water on the road surface is beginning to show reflective patterns in the headlights. Several bridges are ahead on the route. The driver is currently maintaining 6 seconds following distance behind another CMV. Which comprehensive analysis and action sequence is correct?

33. When backing a tractor-trailer, in which direction should you turn the steering wheel if you want the trailer to move to the LEFT?

34. A driver is operating a 70-foot combination vehicle at night on a rural highway with no street lighting. The speed limit is 55 mph, but visibility is reduced to approximately 400 feet due to fog beginning to form. The driver observes a slower passenger vehicle ahead approximately 8 seconds ahead, and a vehicle is approaching from behind, following at about 4 seconds. The driver must analyze speed, visibility, and spacing factors to determine the safest action. What should the driver do?

35. During the walk-around exterior inspection, what lighting and reflector condition is verified to ensure the vehicle meets federal visibility requirements?

36. A combination vehicle is traveling on an icy highway. The driver feels the trailer beginning to swing out to the left while attempting a gradual right curve. What has happened, and what is the correct response?

37. A CDL driver undergoes random alcohol testing during a fuel stop. The test shows a BAC of 0.018%. The driver states they consumed one beer at dinner 5 hours before the test and has been driving for 4 hours since then. What is the correct analysis of this situation under FMCSA regulations?

38. What is the primary purpose of the supply air system in a commercial motor vehicle air brake system?

39. What is the primary purpose of the post-trip inspection that must be conducted at the end of each day’s driving?

40. Under federal Hours of Service regulations for property-carrying drivers, what is the maximum number of hours a driver may drive after 10 consecutive hours off duty?

41. A CDL driver is preparing for a 500-mile overnight trip starting at midnight. The driver slept 6 hours the previous night and worked a non-driving job for 8 hours during the day. The driver feels “tired but functional” and plans to use caffeine and energy drinks throughout the trip. What analysis correctly evaluates this situation?

42. When making a right turn with a tractor-semitrailer, what positioning technique should the driver use to prevent the trailer from encroaching on the curb or adjacent lanes?

43. When should a commercial motor vehicle driver reduce speed for a turn, and why is this timing critical?

44. At highway speeds, how far ahead should a CDL driver look to maintain proper visual search and anticipate hazards?

45. What is the recommended lane position for a commercial motor vehicle when driving on a multi-lane highway?

46. A driver completes a 500-mile trip and during the post-trip inspection notices that the left rear trailer tire has a visible bulge on the sidewall approximately 2 inches in diameter. The driver is due to begin 10 hours of off-duty rest. What is the correct procedure for reporting and handling this defect?

47. A driver completes the day’s trip and performs a post-trip inspection, discovering a leaking brake chamber on the trailer. The driver lists this defect on the DVIR and submits it to the carrier. The next morning, the carrier dispatches the same vehicle without repairing the brake defect. Which analysis correctly describes the regulatory violations in this situation?

48. 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?

49. When approaching a passive railroad crossing (no lights or gates), which precaution must a driver take to analyze crossing safety correctly?

50. A driver is approaching a railroad-highway grade crossing in a 65-foot combination vehicle carrying hazardous materials. The crossing has flashing lights but no gates. A train is visible approximately 1,000 feet away approaching the crossing. Traffic ahead has stopped 50 feet from the nearest rail, leaving approximately 40 feet of space. The driver’s vehicle length plus required stopping distance exceeds this space. Which legal requirement and safety analysis applies?