# MenkyoQuest — Question ch1_sign_48

Chapter: Ch. 1 Common Conduct
Section: 第２節 信号
Type: Multiple choice
Difficulty: hard

## Question
When a police officer has both arms extended horizontally, how should vehicles respond?

## Options
A. All vehicles in all directions must stop immediately
B. Traffic to the sides of the officer's body may proceed, but traffic in front must stop
C. Traffic in front of the officer's body may proceed, but traffic to the sides must stop
D. You may proceed in the direction the arms are pointing

## Correct answer
B. Traffic to the sides of the officer's body may proceed, but traffic in front must stop

## Explanation
According to the Rules of the Road, a police officer's hand signal with both arms extended horizontally means "traffic to the sides may proceed, traffic in front must stop." Vehicles traveling perpendicular to the officer's body may proceed, while vehicles facing the front or back of the officer must stop.

## Driving school curriculum
Stage 1 – Topic 2: Following traffic signals

## Source passage (Rules of the Road)
Rules of the Road, Ch.1 §2 (Signals, Signs & Markings) / 1. Signals: Drivers must obey traffic-signal lights. When a police officer or traffic-directing officer is controlling traffic by hand signals or flashlight, those signals override the traffic-signal lights.

## Tags
信号, 警察官の手信号, 水平, 方向別規制, 選択問題

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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.