Using full-scale construction equipment and truck loadings on a circular track of 260 feet circumference, evaluation of various base thicknesses and types has been accomplished in this first of a series of tests. Fractured and non-fractured aggregate, treated and untreated bases, asphaltic and Portland cement type bases are used. Results of the first ring indicate types of failure under varied environmental conditions with pavement systems subjected to millions of load applications. Difficulties in determining comparative equivalencies are discussed. Instrumentation used and possibilities for future use in rational design are reported.