A school-bus stop arm violation:
Correct. Most states have substantial fines for passing a stopped school bus with red lights flashing. Many install on-bus cameras to capture violations.
CDL Practice Question #504
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.