Ch. 7 · Expressway

When the road surface is dry and the tires are new, you need to maintain a following distance of about 50 meters when traveling at 100 km/h.

[True / False · Medium]

Answer: ✕ False

Explanation

When the road surface is dry and the tires are new, you need to maintain a following distance of about 100 meters when traveling at 100 km/h. 50 meters is insufficient.

Driving school curriculumStage 2 – Topic 16: Driving on expressways

Hikari
Hikari
Fifty meters sounds like plenty of space when the road's dry and my tires are brand new.
Yui
Yui
That's actually false — even in perfect conditions at 100 km/h, you need about 100 meters, not 50.
Hikari
Hikari
Whoa, double what I thought!
Yui
Yui
Yep! High speeds need way more distance than you'd expect. Don't let good conditions fool you.

Source: Ch. 7 Expressway · Section (第2節 2 速度 (4)) · Rules of the Road, Ch.7 §2 (Driving on expressways) / 2(4) — Keep ample following distance. On a dry road with new tires, you need a following distance of about 100 m at 100 km/h and about 80 m at 80 km/h.

🤖 Dig deeper with AI

Send this question's context to ChatGPT for a richer explanation. The prompt also asks the AI to point you back to this chapter's practice quiz.

🚀 Ask ChatGPT

If the button doesn't open ChatGPT, tap Copy and paste it into Claude, Gemini, or any other LLM you prefer. On a free plan, Claude (claude.ai) tends to produce more accurate explanations that respect this site's content.

← Back to all Ch. 7 questions

See the glossary for definitions of key terms.

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.