Urban Road Act Article 14

If the planned width of urban roads is too wide to be completed at one time, a phased project may be formulated and reported to the superior authorities for approval. The original road shall be widened gradually if its width is inconsistent with regulations.
中文原文 市區道路條例第14條
市區道路因計劃寬度過寬,不能一次完成者,得擬具分期完成計劃,報經上級主管機關核定辦理。
原有道路寬度不合規定者,應一律逐漸拓寬。

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