2D solidify. Is it possible? Is there a way to make some "2D solidify" from edges to faces. (It's about creating roads from GIS data). I've tried Skin modifier, converting to curves with depth and back to mesh, but all the methods resulted in a dirty mesh with lots of intersections and bad geometry. The problem seems to be that simple and straightforward that it simply must have a simple way to solve. But I don't see it. Please, point it out.
The easy way, which requires a bit (just a bit) of manual work:


Install "Edit Tools 2" and "Loop Tools" addons. They're both
available in basic blender 2.79/2.79a, so just find them in addons
and enable
Select your edge, hit W > Edit Tools > Offset Edges (make sure you're in edge editing mode)

Offset twice, for both positive and negative direction

Select both of edges you've just created. Hit W > Loop Tools > Bridge