HAZMAT CDL Practice Test

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Get ready for your HAZMAT CDL Test. Use multiple-choice questions and detailed explanations to solidify your understanding. Enhance your preparedness for the exam!

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Under which condition is it legal to move a cargo tank with open valves or covers?

When it contains hazardous materials
When the valves are checked and approved by a supervisor
When it is empty according to 49 CFR 173.29
When it has been cleaned and inspected

The correct answer is: When it is empty according to 49 CFR 173.29

Moving a cargo tank with open valves or covers is permissible when it is considered empty following the criteria set by 49 CFR 173.29. This regulation outlines the conditions under which a tank that previously contained hazardous materials can be regarded as empty, particularly emphasizing that all residue that could pose a risk has been removed and that the tank cannot release vapors or residues that would cause a hazardous situation. When a cargo tank is classified as empty per these regulations, the risks associated with moving the tank are significantly minimized, making it legal to transport it under those specific circumstances. Proper adherence to these guidelines ensures safety for both the carriers and the environment, as it confirms that any possible presence of hazardous materials has been sufficiently addressed.