(1) Subject to the limitations described in Subsection (3) of this Section a person who is employed by Provo City and is not a peace officer may direct traffic on public streets while under the supervision of a peace officer employed by Provo City.

(2) Subject to the limitations described in Subsection (3) of this Section a person who is employed by a college or university and is not a peace officer may direct traffic on public streets while under the supervision of a peace officer employed by the same college or university.

(3) A non-peace officer may direct traffic as described in Subsections (1) and (2) of this Section only in cases of public emergency or to aid in the orderly movement of traffic related to public gatherings in excess of 5,000 people.

(4) It shall be unlawful for the driver of a motor vehicle to fail or refuse to obey the directions of a non-peace officer directing traffic as permitted in this Section.