(a) If a county does not have a comprehensive plan, then that county shall, within three years of the effective date of this act and with the opportunity for the review, comment and participation of the municipalities and school districts within the respective county and contiguous counties, school districts and municipalities, prepare and adopt a comprehensive plan in accordance with the requirements of section 301. Municipal comprehensive plans which are adopted shall be generally consistent with the adopted county comprehensive plan.

(b) County planning commissions shall publish advisory guidelines to promote general consistency with the adopted county comprehensive plan. These guidelines shall promote uniformity with respect to local planning and zoning terminology and common types of municipal land use regulations.