Maybe not so easy to solve. Personally I would use a seperate Street Mesh. Or maybe I would even model some Standard Street Parts: Straight street, Curve Street (both, left and right) and so on. Then I would put the Parts (including Border) onto the Terrain, stick them together very much in a way like one of those Toy car-racing tracks. This way the more distant Parts can be hidden in the fog or whatever, and you could also use Copyentity to reuse the Standard Parts and save some speed.
Are you familar with any Modeling Application?
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