Administrative Regulations on the Establishment and Operation of the Dedicated Taxi Telecommunications Network Article 17

Only one Car Station can be installed on each taxi.If more than one Car Station is found in a taxi, the responsible competent authority of highways shall notify the competent authority to revoke the license of the additional Car Station and the Car Station equipment shall be disposed in accordance with “Administrative Regulations on the Manufacturing, Import and Reporting of Controlled Telecommunications Radio-Frequency Devices”.
中文原文 計程車專用電信網路設置使用管理辦法第17條
一部計程車以設置一車臺為限。
經公路主管機關或有關機關查獲計程車重複設置車臺者,由該管公路主管機關通知主管機關廢止該重複設置之車臺執照,其車臺設備依電信管制射頻器材製造輸入及申報作業管理辦法規定辦理。

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