Common Mistakes to Avoid During the Trucking Commercial Driving Test

Passing your trucking commercial driving test is a critical step toward starting your career as a professional truck driver. The process can be challenging, especially with so much to cover, from vehicle inspection to safe driving skills. Avoiding common mistakes can make all the difference between passing and having to retake the test. Below are key pitfalls to watch out for during your trucking commercial driving test.

1. Poor Pre-Trip Inspection
One of the most common mistakes truck drivers make during the test is a sloppy or incomplete pre-trip inspection. The pre-trip inspection is your opportunity to demonstrate your understanding of safety measures and vehicle readiness. Be sure to thoroughly check all aspects of the truck, including brakes, tires, lights, mirrors, and coupling systems. Missing any key points can result in an automatic failure.

2. Failure to Use Proper Mirror Checks
Constantly checking your mirrors is crucial when operating a large truck. Many drivers fail to check mirrors frequently during lane changes or turning, which can be a major issue in the commercial driving test. Examiners are watching to see if you’re consistently aware of your surroundings. Train yourself to regularly glance at your mirrors to avoid this common mistake.

3. Not Managing Speed Correctly
Speed management is a significant factor during the test, especially since truck driving requires careful control on different road types and conditions. Some drivers either go too fast or too slow, neither of which will impress the examiner. Make sure you're keeping a safe, consistent speed, especially in high-traffic areas, curves, or when approaching stop signs and intersections.

4. Improper Lane Usage
Staying in your lane may sound simple, but many drivers struggle with maintaining lane discipline, especially on narrow roads or when making wide turns. During the test, be cautious when navigating turns, ensuring your vehicle doesn’t cross lane markers. Practice wide, slow turns, and stay in the center of your lane to avoid penalties.

5. Incorrect Shifting
Improper gear shifting is another common error that occurs during the trucking commercial driving test. If you're driving a manual transmission truck, shifting at the wrong time, grinding gears, or stalling can all cause you to lose points. To avoid this, practice smooth shifting and become familiar with the truck's gear pattern before taking the test.

6. Forgetting to Use Turn Signals
Failing to signal lane changes, turns, or merging can easily lead to test failure. Always use your turn signals well in advance to inform other drivers of your intentions. Examiners are strict on this point since proper signaling is vital for road safety, especially in large trucks that have limited visibility.

7. Inadequate Space Management
Trucks require a lot more space than smaller vehicles, both when driving and parking. Many new drivers fail to properly manage the space around their truck, leading to dangerous situations or test deductions. Always maintain a safe distance from other vehicles and obstacles, especially during tight turns, backing maneuvers, or parking.

8. Not Following Road Signs
Ignoring or missing road signs is a big mistake that can cost you during the test. Speed limits, weight restrictions, and warning signs are especially important for truck drivers. Pay close attention to these signs, and make sure to follow them closely throughout the driving portion of your test.

9. Failure to Brake Smoothly
Jerky or hard braking is a common issue, especially for drivers who are unfamiliar with the weight and momentum of a loaded truck. Smooth, controlled braking is crucial to prevent accidents and ensure safety. Practice braking gradually and maintaining a safe following distance to avoid abrupt stops during the test.

10. Nervousness and Overthinking
Finally, nerves can be a major factor in test performance. Many drivers overthink the process, leading to small mistakes that can add up. Staying calm and confident is key. Trust your training and preparation, and remember that the more you practice, the more comfortable you’ll feel behind the wheel.


To give yourself the best chance of passing your trucking commercial driving test, get expert training from Commercial Trucking School in Santa Clarita, CA. With one-on-one instruction and flexible scheduling options, we’ll ensure you're fully prepared. Contact us today to start your journey!