SDCL § 31-4-14.2: Notice of closure or use restriction.

Notice to the public that a state trunk highway is closed or its use is restricted shall be given in one or more of the following forms:

(1) Erection of suitable barriers upon the highway to restrict or prohibit travel;

(2) Issue warning and notice of the condition of the highway for travel in generally available media outlets;

(3) Post signs for direction of traffic upon the highway relative to use or nonuse of the highway;

(4) Place warning devices on the highway; or

(5) Place flagmen to warn, detour, or direct traffic on the highway.