Indigenous Languages Development Act Article 16

Government agencies, schools and publicenterprises in indigenous regions shallset up signs in regional languages.All government authorities shall set upsigns with traditional names in regionallanguages for mountains and rivers,monuments, tribes, streets, and publicfacilities in indigenous regions.The components, range and method ofplacement of the signs specified in thetwo preceding items shall be issued bythe central competent authority.
中文原文 原住民族語言發展法第16條
原住民族地區之政府機關(構)、學校及公營事業機構,應設置地方通行語之標示。
於原住民族地區內之山川、古蹟、部落、街道及公共設施,政府各該管理機關應設置地方通行語及傳統名稱之標示。
前二項標示設置之項目、範圍及方式,由中央主管機關公告之。

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