AASHTO 93: This method is based on the 1993 AASHTO Guide for Design of Pavement Structures. The reliability factor is 80% and the change in pavement serviceability index (PSI) is 2.0.

Full Depth, AASHTO 93: This method is based on the 1993 AASHTO Guide for Design of Pavement Structures. The reliability factor is 80% and the change in pavement serviceability index (PSI) is 2.0. Full depth asphalt pavements are constructed directly on the subgrade. Full depth asphalt is recommended only for a CBR 4 and above subgrade.

Kentucky 6A-99: This method is based on structural numbers identified in Design Memorandum 6A-99 from the Kentucky Transportation Cabinet