Goods can only be carried in a tank if they are in the tank section of the regulations.
All tank vehicles are within scope.
Definitions
Tank
A means of carrying liquids, powders or gases that is secure during transport.
Road tanker
A good vehicle that has a tank that is either:-
Tank Container
Any tank other than a road tanker which is not permanently attached to the vehicle where the capacity is greater than 450 liters. (Smaller would be a package). Often attached by 4 twist locks.
Dangerous Goods
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Driver Training