Practice Quiz

Commercial Driver's License

Category - Basic Operation

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If a commercial vehicle begins to hydroplane, drivers should take the following actions:
  1. Depress the clutch and hit the brakes hard to slow down fast.
  2. Release the accelerator, depress the clutch and brake hard.
  3. Release the accelerator, depress the clutch and use no brakes.
  4. Depress the clutch, downshift, and apply brakes.
Explanation
Answer: C - When operating a commercial vehicle that begins to hydroplane, drivers should release the accelerator pedal, depress the clutch, and NOT use the brakes. Using brakes while hydroplaning often makes the slide worse. By depressing the clutch, the wheels will turn freely and traction will be regained much faster. Drivers should understand that hydroplaning can occur even at speeds as low as 30 mph.
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