This paper presents a simplified method of assessing the impact of a motorway under construction on arable lands. The developed method makes it possible to determine all the losses connected with, the impact of a motorway. The basis for the determination of the studied losses involves an analysis of variations in land use, soil quality classes and in the layout of agricultural roads along the axis of the designed motorway. It is assumed that land value is a measure of the multilateral impact of motorway on arable lands. The specificity of this value lies in the fact that while determining it, only the variation in the utility for agricultural production is assessed. Therefore, it is a measure to assess arable land utility for agricultural production. Thus, this assumed measure of the motorway impact is not a market value. The estimated land value will be close to its market value only in typical agricultural regions where the key parameter to shape the land price is the production potential of such lands. The presented method of assessing the motorway impact on arable land is exemplified by a section of the A-4 motorway. This section is about 14 km long and runs between two towns, Brzozówka and Nowa Jastrząbka. One kilometre of the constructed motorway will result in a decrease in the arable land value by 1154 corn units. The value of arable land will decrease by around 80% in total owing to the acquisition of lands for the construction of the motorway and the toxic impact of the motorway on soils. The remaining 20% of losses in the land value result from the increase in traffic and from the deteriorated spatial arrangement of plots.

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