(a)      If a local legislative body has adopted the transportation element of the plan of the territory within its subdivision jurisdiction or part of the territory, and has filed a certified copy of that plan in the office of the clerk of the circuit court of the county in which the territory or part is located, a plat of a subdivision of land within the territory or part may not be filed or recorded until:

            (1)      The planning commission approves the plat; and

            (2)      The chairman or secretary of the planning commission marks an approval in writing on the plat.

      (b)      (1)      A planning commission may authorize the zoning administrator or an equivalent administrative officer to approve subdivision plats and site plans under subsection (a) of this section in accordance with nondiscretionary criteria adopted and specified by ordinance.

            (2)      The zoning administrator or administrative officer shall indicate approval of a plat by marking an approval in writing on the plat.