A well-stocked complex of isolation green around a motorway should have the highest possible density over the whole year. In order to achieve such a state as early as a few years after planting on former arable land, it is necessary to use a forecrop of fast-growing trees suitable for the initial stage of forest succession. When the forecrop reaches the stage of thicket, it is possible to introduce under its canopy another species which will form a multi-storey, well-stocked plant complex during the whole developmental period. With a proper selection of the species and a substantial proportion of wintergreen plants the further stages of succession will lead to the creation of a complex of expected physiognomy. The formation of such a complex of isolation green is only possible through introducing foreign species along with indigenous ones.

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