I just started working on cleaning up the map around Lakewood, California. The ways are tagged as being from TIGER/Line (United States Census Bureau data) but they are all running at odd angles and have junctions and curves where none exist.

I have been straightening the street, smoothing the curves, and marking important locations around the city (e.g. libraries, post offices, police and fire stations, etc.) The freeway on and off ramps are especially disasterous. Those are taking a lot of work. Some of the major streets have two or even three ways marking them and they are tagged as primary, secondary and residential. It should be much more pretty when I am done. : )