Architects and urban planners use Cadmapper to save hours of routine drawing. It transforms data from public sources such as OpenStreetMap, NASA, and USGS into neatly organized CAD files.
It's free for areas up to 1 km2 and over 200 whole city DXF files.
These are huge and simplified two-dimensional DXF files of metropolitan area road networks, which include 3 levels of roads as polylines, as well as bodies of water. You can also find these in GIS format at Mapzen Metro Extracts.
[-][Top][2D Wireframe]and click
[Top]again to recenter. Read more about how to use these in your program.