Ch. 7 · Expressway

When the road surface is dry and tires are new, at 80 km/h you need to maintain a following distance of about 100 meters.

[True / False · Hard]

Answer: ✕ False

Explanation

Rules of the Road Chapter 7, Section 2, 2(4) specifies, "At 80 km/h, you need to maintain a following distance of about 80 meters." The required distance corresponds to speed: about 100 meters at 100 km/h, and about 80 meters at 80 km/h. It is not 100 meters.

Driving school curriculumStage 2 – Topic 16: Driving on expressways

Hikari

100 meters sounds about right for 80 km/h, doesn't it?

Yui

Actually, that's false! At 80 km/h you need about 80 meters, not 100. The distance matches the speed—100 meters is for 100 km/h.

Hikari

Oh, so it's literally speed equals distance?

Yui

Yep, easy to remember! Your speed in km/h is roughly your following distance in meters.

Source: Ch. 7 Expressway · Section (第２節走行上の注意) · 2 速度 (4) 路面が乾燥していて、タイヤが新しい場合は、時速100キロメートルでは約100メートル、時速80キロメートルでは約80メートルの車間距離をとる必要があります。

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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.