Dangerous Substances Prohibited
危険物積載車両通行止め(きけんぶつせきさいしゃりょうつうこうどめ)
Meaning
A sign prohibiting vehicles carrying dangerous goods. It is mainly placed at underwater tunnels, long tunnels and the like.
Common mistake on the test
Ordinary vehicles may pass. Only vehicles transporting dangerous goods such as explosives or poisons are covered.