A tanker hauling food-grade product (e.g., milk):
Correct. Smooth-bore tanks (no internal baffles) are easier to clean for food-grade products. The trade-off is severe surge — drive slower and brake earlier.
CDL Practice Question #317
Category: Tanker
Why this question matters
This question is one of 50 in our Tanker 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.