(a) There is established an official map of the County. The Commission shall be the maker and custodian of such map. The map shall show the location and lines of the public roads, easements, water courses and public lands within the County existing and/or established by law at the time of the preparation and setting up of the map by the Commission; and shall show the location of the lines of the roads, easements, water courses and public lands on plats which shall have been approved by the Commission at or previous to that time.
(b) Whenever the Commission has prepared an approved official map or any amendment, extension or addition thereto, it shall submit, after public hearing, the approved official map or such amendment, extension or addition thereto, to the county government for its adoption. If the official map or amendment, extension or addition thereto shall pertain to the road system of or any road in Sussex County, the official map or any amendment, extension or addition thereto shall also be submitted to the Department of Transportation for its review and recommendation. Upon receipt of the recommendation from the Department of the official map or such amendment, extension or addition thereto, it shall be returned to the county government for its adoption. If adopted by the county government, the map shall be recorded in the Recorder's office within 30 days after such action.
(c) The Commission may, from time to time, amend, extend, add to or remove from the official map all roads established or vacated by law, or as established by subsection (b) of this section.