Started with the River Road area: bordered by Beltline Road in the north, Northwest Expressway in the west, the Willamette River in the East, and the Chambers Street Bridge in the south. Many of the streets in upper portion of this area have been straightened out, and a few missing streets added.
This was done when the old TIGER dataset was around. The streets were present, but skewed. Much has changed on OSM since then.