Utah Code § 41-6a-302: Placing and maintenance on state highways -- Restrictions on local authorities.

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.