You may not sound your horn except where the law requires it, and you may not sound it even when it is unavoidably necessary to prevent danger.

Explanation

Article 54(2) does ban unnecessary horn use, but it adds an exception: the ban does not apply when sounding the horn is unavoidable in order to prevent danger. So you may use it in that situation.

Guides that explain this

• Japanese Signs That Mean the Opposite of What You Assume: Crosswind, End of Restriction, Minimum Speed
• Japanese Road Signs on the Written Test: The 5 Types Explained

Related terms

• Horn (keionki)

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