Ch. 5 · Driving Method

When traveling at 100 kilometers per hour on an expressway, if the road surface is dry and the tires are new, it is necessary to maintain a following distance of approximately 100 meters or more from the vehicle ahead.

[True / False · Medium]

Answer: ✓ True

Explanation

When the road surface is dry and the tires are new, a following distance of approximately 100 meters is necessary at 100 kilometers per hour. At 80 kilometers per hour, approximately 80 meters is the guideline. If the road surface is wet from rain or the tires are worn, a following distance of approximately twice this distance may be necessary. This is specified in Chapter 5, Section 4 (Safe speed and following distance) of the Rules of the Road.

Driving school curriculumStage 1 – Topic 7: Safe speed and following distance

Hikari
Hikari
100 meters at 100 kph seems way too far—maybe like 50 meters is enough?
Misaki
Misaki
Actually, 100 meters is correct for dry roads and new tires at that speed. That's true.
Hikari
Hikari
So it's basically one meter per kilometer per hour?
Misaki
Misaki
Exactly. Easy rule of thumb—and double it if the road is wet or your tires are worn.

Source: Ch. 5 Driving Method · Section (第４節 安全な速度と車間距離) · 第４節 安全な速度と車間距離

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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.