Tennessee Code Title 54. Highways, Bridges and Ferries § 54-18-208

(a) The making or certifying of a map by the planning commission or the adoption or amendment of an official map by the legislative body shall not constitute the opening or establishment of any highway or the taking or acceptance of any land for highway purposes.

(b) Any highway placed on the official map shall be removed from the map unless the governing body or the department of transportation, as the case may be, has begun acquisition of right-of-way, begun the construction of the highway, or begun the widening or other planned improvement of the highway within the following time limits:

(c) Upon adoption of an official map, the advance acquisition of rights-of-way for those streets on the official map shall proceed as expeditiously as feasible.