When a police vehicle is taking enforcement action against a vehicle that is committing a violation, it must always sound its siren, without exception.
警察の車が違反している車などを取り締まるときは、どんな場合でも必ずサイレンを鳴らさなければならない。
This statement is FALSE
Explanation
Under the proviso, when a police vehicle is taking enforcement action against a vehicle or streetcar that is violating Article 22 of the Act (speed limits), it may omit the siren if this is judged to be particularly necessary. So the siren is not required in every case.
Original text
ただし、警察用自動車が法第二十二条の規定に違反する車両又は路面電車（以下「車両等」という。）を取り締まる場合において、特に必要があると認めるときは、サイレンを鳴らすことを要しない。
Source: Order for Enforcement of the Road Traffic Act — 道路交通法施行令 第十四条（緊急自動車の要件） · Cabinet Order No.270 of 1960
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