More than 300 pocket penetrometr tests were done on core barrel samples in the course of research the ground for the construction of A1 motorway in Poland. Compressive strength of soil was verified by laboratory tests of water content (wn), plasticity limit (wP) and liquidity limit (wL), which were used for determination of liquidity index (IL) and consistency index (IC). The results were processed statistically and related to previously published correlations between liquidity index (IL) and compressive strength (Qf). The result of work is a new proposal of correlation enabling rapid estimation of the liquidity and consistency indexes.

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