In accordance with Section 72-3-109, a highway authority shall place and maintain traffic-control devices:
(1) in conformance with the standards and specifications adopted under Section 41-6a-301 on all highways under the highway authority's jurisdiction; and
(2) as the highway authority finds necessary to:
(a) carry out the provisions of:
(i) this chapter; or
(ii) a local traffic ordinance if the highway authority is a local highway authority; or
(b) regulate, warn, or guide traffic.