The most appropriate publication to use if you were transporting hazardous materials from the US to Japan via a maritime vessel is the IMO (International Maritime Organization's IMDG (International Maritime Dangerous Goods Regulations)
IATA DGR - International Air Transport Association Dangerous Goods Regulations would be the most appropriate publication to use if you were transporting hazardous materials via commercial air
AFMAN (Air Force Manual 24-204 (I))
When transporting regulated hazardous materials from the US to Japan on an oceangoing vessel, the most appropriate set of regulations to comply with are the International Maritime Dangerous Goods (IMDG) Regulations, published by the International Maritime Organization (IMO)
Small quantities of certain regulated hazardous materials may be carried on a motorcycle, but in general a motorcycle is not an appropriate vehicle for transporting regulated hazardous materials.
IMDG
The International Maritime Dangerous Goods Code (IMDG Code), issued by the International Maritime Organization (IMO), regulates the movement of hazardous material by vessels in international waters.
The US Department of Transportation regulations (49 CFR) applies to all shipments of hazardous materials within, to and from the US. Other regulations (those of the country of origin, destination or transit) will apply, in addition, to shipments from or to the US. And if the material is sent by air or ocean vessel, still other regulations will apply.
If you ship hazardous materials from, to, within or through the territory of the United States you must comply with the DOT regulations governing transportation of hazardous materials.
There is no minimum weight for the transportation of hazardous materials. You can transport as little as you like.
Yes, there are times when sheltering-in-place is a appropriate action following a hazardous materials accident.
Buses and vehicles transporting hazardous materials are required to by law.
Buses and vehicles transporting hazardous materials.