You have loaded a hazardous material into a cargo tank. What must you do before you move the vehicle?

• A. Close all manholes and valves and be sure they are free of leaks
• B. Remove all labels
• C. Deflate the tires
• D. Lock the doors

Answer: (A)

Before moving a loaded hazmat cargo tank, secure every opening and verify there are no leaks. Close all manholes and valves and check seals for leaks because movement can disturb closures, causing vapors or contents to escape and create exposure or environmental hazards. Keeping openings closed prevents release during transit. Labels should remain on the tank to warn others about the hazard, and deflating tires is not required and would introduce additional safety risks. Securing doors is important for security, but the critical safety step is ensuring all openings are closed and leak-free before movement.