Hello. Please note that roads are not classified based on length but rather on the basis of connectivity with other roads and places and importance within the road network, and occasionally other factors such as traffic data and physical construction of the roadway. In this case, Smoke Ranch serves as a relatively busy arterial which serves commercial areas, and when combined with Carey Avenue, spans many other major roadways Between Buffalo and Nellis Blvd. Tertiary classification, in an urban scenario like this, usually applies to smaller, lower-traffic but still important roadways which we would call collector roads.