Cleaned up the 405/520 interchange East of Seattle. There was a great version worked on by a minimum of 3 OSMers that was all tangled up with the TIGER import data.

The USGS UrbanArea WMS helped a lot:

http://terraservice.net/ogcmap.ashx?version=1.1.1&request=GetMap&Layers=urbanarea&Styles=&SRS=EPSG:4326&format=image/jpeg&

I also tried to correct all the layers and added bridge tags. Waiting to see how it turns out in Osmarender.