# MenkyoQuest — Question ch6_trap_06

Chapter: Ch. 6 Hazardous Areas
Section: 第3節 夜間 - 灯火
Type: True/False
Difficulty: medium

## Question
In dense fog on an expressway when visibility is less than 100 meters, you must turn on your headlights, clearance lights, tail lights, and other lights while driving.

## Correct answer
True

## Explanation
The Rules of the Road set the threshold for turning on headlights and other lights in tunnels or dense fog at 50 meters of visibility on regular roads and 200 meters on expressways. On an expressway where you cannot see 100 meters ahead, you naturally cannot see 200 meters either, so this meets the threshold and the lights are required.

## Driving school curriculum
Stage 2 – Topic 7: Driving in adverse conditions

## Source passage (Rules of the Road)
Rules of the Road, Ch.6 §3 (Night) / 2 Lights (1) — Even in daytime, turn on your headlights, side lights, and tail lights when you cannot see 50 m ahead (200 m on expressways), e.g. in tunnels or thick fog.

## Tags
灯火, 高速道路, 濃霧, 数値, 視界不良

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- HTML version: https://www.menkyoquest.com/en/q/ch6_trap_06
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Source basis: National Police Agency's official Rules of the Road manual (Public Domain under Article 13 §2 of Japan's Copyright Act).
Copyright on AI-drafted explanations belongs to the MenkyoQuest team.