Utah Code Title 41. Motor Vehicles § 41-6a-602. Speed limits established on state highways

(1)(a) The Department of Transportation shall determine the reasonable and safe speed limit for each highway or section of highway under its jurisdiction.

(b) For each highway or section of highway, each speed limit shall be based on a traffic engineering and safety study consistent with the requirements and recommendations in the most current version of the “Manual on Uniform Traffic Control Devices.”

(c) The traffic engineering and safety studies shall include:

(a) time of day;

(b) highway construction;

(c) type of vehicle;

(d) weather conditions; and

(e) other highway safety factors.

(3)(a) Except as provided in Subsection (3)(b) and (c), a posted speed limit may not exceed 65 miles per hour.

(b) Except as provided in Subsection (3)(c), a posted speed limit on a freeway or other limited access highway may not exceed 75 miles per hour.

(d) This Subsection (3) is an exception to the provisions of Subsections (1) and (2).

(a) the county for state highways in an unincorporated area of the county;

(b) the municipality for state highways within the municipality's incorporated area;

(c) the Department of Public Safety; and

(d) the Transportation Commission.