Ch. 4 · Pre-Drive Conduct

A driver whose hearing in both ears is impaired to the extent that they cannot hear an 80-decibel warning horn at a distance of 10 meters, even with a hearing aid, must display a hearing impairment mark.

[True / False · Hard]

Answer: ✕ False

Explanation

The Rules of the Road, Chapter 4, Section 1, 1(1)F clearly states "90 decibels." The "80 decibels" in the question is incorrect; the correct value is "90 decibels." This is a trick question that requires accurate recall of the numerical value.

Driving school curriculumStage 1 – Topic 1: Driver's mindset

Hikari
Hikari
80 decibels seems specific enough to be right.
Misaki
Misaki
That's false. The correct threshold is 90 decibels, not 80.
Hikari
Hikari
Ugh, they just swapped in a different number?
Misaki
Misaki
Precisely. This one tests whether you've memorized the exact value—90 is the key number.

Source: Ch. 4 Pre-Drive Conduct · Section (第１節 運転に当たつての注意) · 1(1)カ 両耳の聴力が補聴器を用いても10メートルの距離で90デシベルの警音器の音が聞こえない程度の聴覚障害のあることを理由に免許に条件を付されている運転者

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Source content excerpted from the NPA “Rules of the Road” instructional manual, in the public domain under Japanese Copyright Act Article 13(2). Explanations are AI-assisted and copyrighted by the MenkyoQuest editorial team.