Ind. Code § 8-23-12-1

Sec. 1. As used in this chapter, "sufficiency rating" means any rating that assigns numerical values to each road section reflecting its relative adequacy based on an engineering appraisal of structural condition, safety, and traffic service and upon an economic appraisal of its actual or potential value to the total area served by the road including the effect of loss of traffic to and through the area resulting from deterioration or obsolescence of the road.