Ch. 2 · 第３節 横断の仕方
When the pedestrian signal begins flashing green, you must not begin crossing.
[True / False · Easy]
Answer: True
Explanation
This is correct. The Rules of the Road, Chapter 2, Section 3, "2 (3)" clearly states: "When the light begins flashing green, you must not begin crossing." A flashing green has the same meaning as a yellow signal, and beginning to cross is prohibited.
Source: Ch. 2 · Section (第３節 横断の仕方) · ２（３）青の点滅になったら横断を始めてはいけません。
See the glossary for definitions of key terms.