When passing on the right of a specified small motorized bicycle (electric kick scooter) or a light vehicle (such as a bicycle) travelling in the same direction — other than when overtaking it — you must, if there is not enough space between you, proceed at a speed that is safe for that gap.
同じ方向に進んでいる特定小型原動機付自転車など（電動キックボードなど）の右側を通り過ぎるとき（追越しの場合を除く）、十分な間隔がないなら、その間隔に応じた安全な速度で進まなければならない。
This statement is TRUE
Explanation
This is Article 18(3). The rule covers "specified small motorized bicycles, etc.", which includes light vehicles such as bicycles. It does not apply to riders on a sidewalk or a cycle path, and it does not apply when you are overtaking. Article 18(4) also requires the specified small motorized bicycle or light vehicle itself to keep as far to the left edge of the road as possible.
Original text
当該車両と当該特定小型原動機付自転車等との間に十分な間隔がないときは、当該特定小型原動機付自転車等との間隔に応じた安全な速度で進行しなければならない。
Source: Road Traffic Act — 道路交通法 第十八条（左側寄り通行等） · Act No.105 of 1960
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