Ch. 1 · Common Conduct

When a flashing yellow signal is displayed, you must slow down to a stop-ready speed (jokō) and proceed with caution for other traffic.

[True / False · Medium]

Answer: ✕ False

Explanation

A flashing yellow signal means "proceed with caution for other traffic," but there is no obligation to slow down to jokō. Correctly, you may proceed at normal speed while paying attention. Be careful not to confuse this with jokō.

Driving school curriculumStage 1 – Topic 2: Following traffic signals

Hikari
Hikari
Flashing yellow means slow way down to that jokō speed, right?
Yui
Yui
Not quite—this one's false! Flashing yellow just means proceed with caution; you don't have to slow to jokō. You can keep going at normal speed as long as you're watching for other traffic.
Hikari
Hikari
Oh, so it's way less strict than I thought!
Yui
Yui
Exactly. Don't mix it up with jokō—flashing yellow is all about staying alert, not crawling to a stop-ready speed.

Source: Ch. 1 Common Conduct · Section (第２節 信号) · Rules of the Road, Ch.1 §2 (Signals, Signs & Markings) / 1. Signals: Drivers must obey traffic-signal lights. When a police officer or traffic-directing officer is controlling traffic by hand signals or flashlight, those signals override the traffic-signal lights.

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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.