Ch. 7 · Expressway

Which following distance is correct when the road surface is wet and tires are worn? (Compared to the following distance when the road surface is dry and tires are new)

[Multiple choice · Hard]

Answer: B: About 2 times

Explanation

Rules of the Road Chapter 7, Section 2, 2(4) specifies, "When the road surface is wet and tires are worn, a following distance of about twice this amount may be necessary." About twice the following distance required on a dry road surface with new tires is needed.

Driving school curriculumStage 2 – Topic 16: Driving on expressways

Hikari
Hikari
Worn tires on wet roads? I'd say maybe 1.5 times the distance should do it.
Yui
Yui
Actually, you need about twice the following distance. Worn tires grip way less on wet pavement, so you can't stop as quickly.
Hikari
Hikari
Oh wow, double? That's more than I thought!
Yui
Yui
Yeah! Think of it this way: bad tires plus slippery roads equals a lot more sliding. Give yourself that cushion.

Source: Ch. 7 Expressway · Section (第２節 走行上の注意) · 2 速度 (4) また、路面が雨にぬれ、タイヤが減つている場合は、この約２倍程度の車間距離が必要となることがあります。

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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.