Green areas around motorways can be potential sources of toxic substances, especially risk elements, which come from internal combustion engines. The aim of this study was to determine the level of soil contamination in the vicinity of the largest motorway in the Czech Republic, the D1. Soil contamination indices such as the contamination factor (C_f^i), Potential ecological risk index E_f^I and Potential toxicity response index (RI). Lead (Pb), copper (Cu), and mercury (Hg) were selected as elements of interest. The soil contains, on average, 0.18 mg/kg Hg, 34.32 mg/kg Pb, and 15.48 mg/kg Cu. The calculations of the above factors showed that the content of the measured elements does not represent a serious problem for the environment. Hg can be considered the most risky element, as ecosystems are very sensitive, even to small amounts.