Ch. 1 · Common Conduct

In a section where there is a "road construction" warning sign, you must slow down to a stop-ready speed (jokō) in all cases, and failure to do so is a violation.

[True / False · Medium]

Answer: ✕ False

Explanation

Warning signs give advance notice of hazards or situations requiring attention on the road and call for caution, but they do not directly impose an obligation to slow down to a stop-ready speed. You must travel at an appropriate speed according to the construction conditions and other signs, road markings, or instructions from traffic control personnel, but it is not stipulated that you must slow down to a stop-ready speed "in all cases."

Driving school curriculumStage 1 – Topic 2: Following traffic signals

Hikari
Hikari
Road construction ahead means I have to slow way down every time, right? Otherwise it's a violation?
Yui
Yui
Actually, that's false. Warning signs tell you to be careful, but they don't force you to crawl to a stop-ready speed in every case—you adjust based on the actual conditions and any other signs or workers directing traffic.
Hikari
Hikari
Oh, so it's more like 'use good judgment' than 'always do this one thing'?
Yui
Yui
Exactly! Drive at an appropriate speed for the situation, not just one fixed rule for all construction zones.

Source: Ch. 1 Common Conduct · Section (第２節 信号) · Rules of the Road, Ch.1 §2 / 2(4) Warning signs alert road users in advance to hazards or situations on the road that require caution. Types and meanings are listed in Appendix 3(1).

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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.