Aircraft Flight Operation Regulations Article 30

An operator shall not conduct CAT II / CAT III instrument approach and landing unless runway visual range (RVR) information can be provided and meet CAT II / CAT III’s requirements.
中文原文 航空器飛航作業管理規則第30條
航空器使用人非於跑道視程資訊能提供執行第二類及第三類儀降作業時,不得實施第二類及第三類儀降作業。

English translation for reference only; the Chinese text prevails. Not legal advice.