The present paper offers a methodological scheme to validate the calculated values of soil properties for the design of road pavement considering strength conditions. The scheme includes a two-stage research. The first stage includes the steps to define homogeneous areas (road district). The second stage includes the work on validation of the calculated values of subgrade clay soils properties for the road district defined earlier. Specification of boundary lines of road-climatic zones has been implemented on the basis of the taxonomic system "zone-subzone-road district". The calculated values of moisture content, strength, and deformability characteristics of clay soils, established and differentiated according to road-climatic zones, will ensure the required level of the reliability of transport infrastructure facilities during their life cycle. The economic effect of using the validated values of moisture content, strength, and deformability of clay soils in the design of road pavements in the price level of 2015 amounts to nearly 3 thousands and 4 million rubles per 1 km of auto road.
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