The classification of the road area and the nature of the county's interest therein, according to the following classification:
Class A. Public expenditure made,
Class B. No public expenditures made or nonascertainable from records,
Class 1. No part thereof lies in any plat,
Class 2. Part or all lies within a platted subdivision,
Class 3. Did not remain unopened for public use for a period of five years after the authority was granted for opening it,
Class 4. Remained unopened for public use for five or more years after the order made or authority granted for opening it,
Class 5. Is contained within that portion of a plat which is to be replatted,
Class 6. Abandoned in fact due to relocation of right-of-way,
Class 7. Informalities exist in the records of title which are construed to invalidate and divest the public of any right, title or interest in the right-of-way;