(b) A county, multicounty, regional or joint comprehensive plan may include the planning of towns, villages or municipalities to the extent to which, in the planning commission's judgment, they are related to the planning of the unincorporated territory of the county as a whole: Provided, That the comprehensive plan shall not be considered a comprehensive plan for any town, village or municipality without the consent of the planning commission and/or the governing body of the town, village or municipality.
(c) A comprehensive plan should be coordinated with the plans of the department of transportation, insofar as it relates to highways, thoroughfares, trails and pedestrian ways under the jurisdiction of that planning commission.
(d) A county planning commission may prepare a comprehensive plan for either the entire county or a part of the county.
(e) A multicounty, regional or joint planning commission may prepare a comprehensive plan for land within its jurisdiction.