Only police officers may direct traffic with hand signals; traffic patrol officers (kotsu-junshiin) may not direct traffic at all.
手信号によって交通整理を行うことができるのは警察官だけで、交通巡視員は交通整理を行うことはできない。
This statement is FALSE
Explanation
Article 6(1) states that police officers AND traffic patrol officers (together called 'police officers, etc.') may direct traffic by hand signals. Traffic patrol officers are included.
Original text
警察官又は第百十四条の四第一項に規定する交通巡視員(以下「警察官等」という。)は、手信号その他の信号(以下「手信号等」という。)により交通整理を行なうことができる。
Source: Road Traffic Act — 道路交通法 第六条(警察官等の交通規制) · Act No.105 of 1960
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