- A Once per month
- B Once per week
- C At the start of each trip and each time the vehicle is parked Correct answer
- D Only at fueling
Why this is the correct answer
Tire checks at start of trip and at each parking are required for placarded vehicles. Hot tires can be the first sign of a brake or wheel issue that could ignite a load.
How this topic appears on the test
The Hazardous Materials CDL exam covers Tires as a recurring theme. Test-writers favor questions that probe whether the applicant has internalized the safe operating procedure, not merely memorized the rule. When you encounter a question on this topic, slow down and verify that the answer you've chosen describes what a careful, defensive driver would actually do — not what is technically permissible.
If you missed this question, that's exactly the right outcome of a practice session: the goal is to surface gaps before the actual test. Open your state CDL manual to the Tires section and re-read the relevant subchapter. Then come back and run through the rest of the Hazardous Materials practice exam.
For drivers preparing for the Hazardous Materials CDL exam, additional context — including federal manual excerpts, employer hiring practices, and DOT medical guidance — is widely available from industry resources. Continue reading on a recommended industry resource for further detail. Always cross-check anything you read with the current edition of your state CDL manual, since enforcement guidance is updated periodically.