The Organization law of the Directorate General of Highways Ministry of Transportation and Communications Article 5

There is one director ranking thirteenth in a senior level position and two deputy directors ranking twelfth in senior level positions in the General Administration.
中文原文 交通部公路總局組織法第5條
本局置局長一人,職務列簡任第十三職等;副局長二人,職務列簡任第十二職等。

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