CDL General Knowledge Practice Test Part 6

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

2. You are driving a 40-foot straight truck on a two-lane highway at 45 MPH. A vehicle behind you is tailgating closely, maintaining a following distance of approximately 2 seconds. What is the safest response to handle this tailgating situation?

3. You are driving a tractor-semitrailer at night on a rural highway. Your speed is 55 MPH, and the road is dry with clear weather conditions. However, you notice that your headlights are properly adjusted but several vehicles ahead have dimmed their headlights when approaching oncoming traffic. At what distance from an oncoming vehicle should you dim your high beams to low beams?

4. You are driving a loaded tractor-semitrailer on a highway during a rainstorm when you begin to experience hydroplaning—the tires lose contact with the road surface and the vehicle feels like it is floating. The steering becomes unresponsive. What is the correct sequence of actions to recover from hydroplaning safely?

5. Which steering method is recommended for commercial motor vehicle operation to maintain smooth control and prevent over-correction?

6. You are driving a tractor-semitrailer on a mountain highway approaching a steep 6% downgrade that extends for 3 miles. The posted speed limit at the top of the grade is 55 MPH. What is the correct procedure for safely descending this grade?

7. You are driving a tractor-semitrailer and approaching a railroad-highway grade crossing with multiple tracks. The crossing has no gates but has flashing lights and crossbuck signs. You observe a train passing on the nearest track, and the lights have stopped flashing. What is the correct procedure for crossing these multiple tracks safely?

8. A commercial driver is stopped at a weigh station for a routine inspection. During the inspection, the law enforcement officer conducts a breath alcohol test. What Blood Alcohol Concentration (BAC) level would result in immediate CDL disqualification for a commercial driver operating a commercial motor vehicle?

9. You are driving a tractor-semitrailer on a highway when the vehicle begins to skid on a slick surface. The rear of the tractor is sliding toward the right side (trailer is pushing the tractor into a potential jackknife). You have the engine brake (jake brake) engaged from earlier driving. What is the correct sequence of actions to recover from this skid safely?

10. 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?