(1) The board shall adopt rules to select preservation and improvement projects under this chapter taking into consideration, at a minimum, the following priority rating factors:
(a) Investment in overburdened communities;
(b) Environmental health disparities as identified in the environmental health disparities map specified in RCW 43.70.815;
(c) Location on or providing direct access to a federally recognized Indian reservation or lands;
(d) Sustaining the structural, safety, and operational integrity of the road;
(e) Vehicle and pedestrian collision experience;
(f) Access improvements to a community facility; and
(g) Identified need in a state, regional, county, or community plan.
(2) Proposed projects must be included in the respective county's six-year plan as provided in RCW 36.81.121 before board approval of the project.