Texas Transportation Code - TRANSP § 257.023. Exclusion of Certain Territory of Existing Districts From Road District

(a) A county commissioners court may exclude from a proposed road district any territory that is part of or adjacent to an existing road district that includes all or part of a levee improvement district, drainage district, or other improvement district created under a law authorized by Section 52, Article III, Texas Constitution.  The excluded territory shall continue to bear and pay its proportion of existing debt created for the construction of macadamized, graveled, or paved roads or turnpikes or in aid of these purposes, but may not be used to pay debt created for those purposes after the territory is excluded from the new road district.

(b) Except as specifically permitted by Sections 1471.086 and 1471.087, Government Code, a road district may not contain a fractional part of a preexisting road district.