Practice question

During a written exam:

  1. Cell phones may be placed on airplane mode.
  2. Cell phones must be turned off.
  3. Cell phones may be left on, but must be set in a face down position.
  4. Cell phones may be left on.

Answer: B — Cell phones must be turned off.

The correct answer is shown above. Try the full quiz for additional practice.

Practice more: District Of Columbia CDL Class B Knowledge Test 2 →