(1) The department shall adopt a sufficiency rating system for roads on the State Highway System.
(2) Such system shall include, but shall not be limited to, the consideration of the following factors:

(a) Structural adequacy;

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(b) Safety; and
(c) Service.
(3) The determination of rating, at a minimum, shall take into consideration the volume of traffic using the roads and the minimum engineering standards required to safely accommodate such volume of traffic; the age of the roads; the width of pavement and shoulders; the number and degree of curves, both horizontal and vertical; ridability; and maintenance economy.