Administrative Regulations on the Establishment and Operation of the Dedicated Taxi Radio Station Article 17

The person who established the Stations shall install a 24-hour automatic recording system to record the conversations, which shall be retained for one week.The competent authority of highways shall accompany NCC and police agency to check records as described in the preceding Paragraph on a regular basis each year. Whenever deemed necessary, the competent authority of highways may conduct irregular inspections.
中文原文 計程車專用無線電臺設置使用管理辦法第17條
電臺設置者須設置二十四小時自動錄音系統,記錄話務內容,並保存一週。
公路主管機關每年定期會同本會、警察機關查核前項紀錄。
必要時,公路主管機關得不定期查核。

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