Thanks Grouch. I never thought of the TDG manual from CANUTEC as a PDF download. It will be the perfect thing.
Not only will it help me explain the placard system but it will let me explain the UN and NA ID numbers too.
I am not trying to certify them for TDG, just to give them a heads-up and let them know why binoculars are good things to have with them on the road.

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May set off to explore without any sense of direction or how to return.