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Question:

You have a vehicle without racks to hold cylinders of compressed gas. You may load such cylinders only if they are:

A Loaded upright or braced laying down flat.
Explaination

If your vehicle does not have racks to hold cylinders, the cargo space floor must be flat. The cylinders must be: (1) Held upright. (2) Cylinders may be loaded in a horizontal position (lying down) if it is designed so the relief valve is in the vapor space.