Ch. 1 · 第２節 信号
When a green light is displayed, vehicles may proceed in any direction: straight, left, or right.
[True / False · Easy]
Answer: True
Explanation
According to the Rules of the Road, a green light indicates that you "may proceed," and vehicles are permitted to go straight, turn left, or turn right. However, there is no obligation to proceed.
Source: Ch. 1 · Section (第２節 信号) · 第２節 信号、標識・標示に従うこと（1. 信号の意味）
See the glossary for definitions of key terms.