Building a road from a line

Hello everyone!
Help me deal with this problem. At some stage in the design of the road, the plane of the road fills the internal apartments.
the road is built only along the line:

In this case, the road plane fills all quarters.: (28.8 KB)
Road.3dm (36.0 KB)

thanks (26.5 KB)

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Модель города.3dm (774.3 KB)