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General Knowledge Practice Question 26

RequiredGeneral Knowledge · Question 26

Vehicles always required to stop at every railroad crossing include:

• AAll commercial vehicles
• BPlacarded hazmat vehicles, buses with passengers, and certain cargo tankers
• COnly school buses
• DOnly delivery trucks

Correct answer: B. Placarded hazmat vehicles, buses with passengers, and certain cargo tankers

Why: Federal rules require placarded hazmat carriers, buses with passengers, school buses, and certain cargo tankers (loaded or empty) to stop at every public railroad crossing.

How this question fits the General test

FMCSA requires General Knowledge competency under 49 CFR 383.111 because every CDL holder operates a heavy vehicle in mixed traffic where situational judgment, pre-trip discipline, and emergency response routinely separate a safe trip from a fatal one.

Study technique for this topic

Read the FMCSA Model CDL Manual Section 2 cover to cover, then re-read it focused on numbers — speeds, distances, weights, and pressures. Use the practice questions in this category to drill those numeric thresholds until you can answer without hesitation.

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Continue your CDL preparation

The General Knowledge portion of the CDL knowledge exam covers more than this single question. Use this site's full General Knowledge bank to drill every topic, then test yourself with one of our state-specific practice sets to confirm you are ready for the actual DMV exam in your state. Always check your state's CDL handbook for any local addenda before the test day.

If you are still building your overall CDL foundation, start with the General Knowledge bank — every CDL applicant must pass it — and then work outward to the endorsements you plan to add.