This Grasshopper Script takes data from openstreetmap.org to generate a site plan in Rhino 5.0. From here the linework of the site plan can be exported as a DWG or Adobe Illustrator file for further editing of the line work. This script is highly customizeable and useful for creating diagrams and site plans within a matter of minutes. Above you can see how the Major Roads, Secondary Roads, and Tertiary Roads can be drawn with polylines on seperate layers.
Dupont Circle Site Plan- Major Roads (Grey), Secondary Roads (Purple), Tertiary Roads (Green), Waterways (Blue) and Buildings (Black)