When changing lanes to the left while continuing in the same direction, you must signal about 3 seconds before you start to change lanes.
同じ方向に進みながら進路を左に変えるときの合図は、進路を変えようとする時の約3秒前に行う。
This statement is TRUE
Explanation
For a lane change, the signal is given about 3 seconds before you begin to move over. Do not confuse this with the 30-meter rule, which applies to left turns, right turns, and U-turns.
Original text
同一方向に進行しながら進路を左方に変えるとき。進路を変えようとする時の約３秒前。
Source: Rules of the Road — 交通の方法に関する教則 第5章 自動車や一般原動機付自転車の運転の方法 第5節 進路変更など · National Public Safety Commission Notification No.3
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