Urban Road Act Article 15

During the period of road construction, the passage of vehicles and pedestrians may be restricted or diverted to another road.The abovementioned paragraph shall be announced and shall not be extended. In case of special circumstances, any extension of the period shall also be announced if the construction cannot be completed on schedule.
中文原文 市區道路條例第15條
在修築道路工程進行期間,得限制車輛、行人通行或規定改道通行。
前項期間應行公告,不得拖延,如因特殊事故、不能如期完工時,其所需展延期間,亦應公告之。

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