After the local planning commission shall have made and recommended to the appropriate governing authority maps on which are indicated the locations of the lines recommended by the planning commission as the mapped boundary lines of future streets and highways, future street and highway extensions and widenings, future public building sites, public parks, public utilities, public playgrounds and other future public open space areas, the appropriate governing authority may adopt such maps as the official maps.

Before adopting the map as the official map, the governing authority shall hold a public hearing thereon which shall be advertised and conducted according to the lawfully prescribed procedures for that municipality or county. If no established procedures exist, then at least fifteen days’ notice of the time and place of the public hearing shall be published in a newspaper of general circulation in the municipality or county.