In counties that have adopted a home rule charter, as provided for in Article 11 subsection 4 of the state Constitution, the duties and responsibilities of the county engineer set forth in chapter 36.80 RCW may be modified by the county legislative authority as allowed by existing constitutional law, statutory law, and the county's charter.

If the legislative/executive authority of a charter county has modified/delegated the statutory duties of the county engineer, the county shall submit the resolution or ordinance adopting these modifications/delegations to the county road administration board within five business days of adoption. This shall include any subsequent written delegations of authority.