You should back from the driver's side rather than the passenger's side when possible because:
Correct. Driver-side ("sight side") backing gives the driver direct visual feedback through the open window in addition to mirror checks.
CDL Practice Question #57
Category: General Knowledge
Why this question matters
This question is one of 97 in our General Knowledge bank. The reasoning above comes directly from the AAMVA CDL Manual, the source document used by every U.S. state DMV. Memorizing the underlying rule — not just the letter answer — is what separates passing on the first attempt from a return trip and another fee.