When you encounter a railroad crossing without warning devices on a low-traffic spur:
Correct. Limited exceptions exist for industrial spurs and abandoned tracks. Always verify and prefer to stop when in doubt.
CDL Practice Question #481
Category: School Bus
Why this question matters
This question is one of 55 in our School Bus 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.