YOU SAID:
When this sign is under water, this road is impassable
INTO JAPANESE
この標識が水中にあるとき、この道路は通行できません
BACK INTO ENGLISH
This road is impassable when this sign is underwater
INTO JAPANESE
この標識が水中にあるとき、この道路は通行できません
BACK INTO ENGLISH
This road is impassable when this sign is underwater
You've done this before, haven't you.