This program enables users to design bases for interlocking concrete pavements. Users can design aggregate, cement or asphalt stabilized, or asphalt bases. The program uses the flexible pavement design methodology in the 1993 AASHTO Guide for Design of Pavement Structures. The user provides soil subgrade and drainage information, anticipated traffic loads as 18,000 lb (80 kN) axle loads up to 10 million, and the base material type. The program outputs base and subbase thicknesses. The user can change default values in the program. Program use must be accompanied by reading ICPI Tech Spec 4 Structural Design of Interlocking Concrete Pavements free on this website and/or purchase ASCE 58-10 Structural Design of Interlocking Concrete Pavement for Municipal Streets and Roadways. The program runs using metric or traditional U.S. units. Download the free programs below: