FREE PennDOT Commercial Driver’s License Questions and Answers
When driving a commercial vehicle, what is the maximum legal blood alcohol concentration (BAC) allowed?
For commercial drivers, the legal BAC limit is lower than for non-commercial drivers (0.08%). A BAC of 0.04% or higher can result in disqualification from operating a commercial vehicle.
If your vehicle begins to skid, what should you do?
Steering in the direction of the skid helps you regain control of the vehicle by aligning the wheels with the direction of travel.
What is the purpose of air brakes in a commercial vehicle?
Air brakes use compressed air to apply braking force, providing the extra stopping power needed for large, heavy commercial vehicles.
How often should cargo be inspected during a trip?
Federal regulations require drivers to inspect cargo within the first 50 miles of the trip and then periodically, usually every 150 miles or every 3 hours, to ensure it is secure.
What should you always check during a pre-trip inspection?
A pre-trip inspection ensures the vehicle is safe to operate. This includes checking critical components like windshield wipers, brakes, lights, tires, and fluid levels.