When changing lanes to the right while continuing in the same direction, signaling 1 second before the move is enough.
同じ方向に進みながら進路を右に変えるときは、その行為をしようとする時の1秒前に合図をすればよい。
This statement is FALSE
Explanation
It is 3 seconds, not 1 second. Both left and right lane changes require a signal 3 seconds in advance.
Original text
同一方向に進行しながら進路を右方に変えるとき。その行為をしようとする時の三秒前のとき。
Source: Order for Enforcement of the Road Traffic Act — 道路交通法施行令 第二十一条（合図の時期及び方法） · Cabinet Order No.270 of 1960
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