Ch. 1 · 第２節 信号
When a pedestrian signal starts flashing green, pedestrians who have already started crossing must finish crossing quickly or turn back, but pedestrians who have not yet started crossing must not begin crossing.
[True / False · Hard]
Answer: True
Explanation
According to the Rules of the Road, a flashing green pedestrian signal means "do not start crossing." Pedestrians already crossing must finish quickly or turn back, but new pedestrians may not begin crossing.
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.