The legislature encourages counties, in conjunction with cities, metropolitan planning organizations, and transit agencies in metropolitan areas to adopt goals for reducing the proportion of commuters who drive in single-occupant vehicles during peak commuting periods. Any county imposing a tax under this chapter must adopt such goals. In adopting these goals, counties shall consider at least the following:

(1) Existing and anticipated levels of peak-period traffic congestion on roadways used by employees in commuting to work;

(2) Existing and anticipated levels of transit and vanpool service and carpool programs available to and from the worksite;

(3) Variations in employment density and employer size;

(4) Availability and cost of parking; and

(5) Consistency of the goals with the regional transportation plan.