Sec. 4. (a) If the works board of a unit wants to make an improvement under this chapter, the works board must first do the following:
(1) Adopt a preliminary resolution for the improvement.
(2) Adopt and place on file cross-sections, general plans, and specifications for the work at the time the preliminary resolution is adopted.
(b) This subsection does not apply to a county. The cross-sections, plans, and specifications filed under subsection (a) must conform to any paving standards adopted by the works board, unless engineering practice justifies a different design.