As I began creating the Cleveland Neighborhood map - (see http://skorasaurus.wordpress.com/cleveland-neighborhood-map/ for more information),

Some of the OpenStreetmap data (as of Dec. 2010) in Cleveland, generated from TIGER data in 2007 was inaccurate. Some of this data had roads that no longer exist, were not at the same GPS coordinates as in real life, and did not have roads that were newly created, or had incorrect names. I’ve traveled on many of Cleveland’s roads to verify the existing data.

As I began editing the Cleveland area in OSM, the TIGER map on Mapquest - http://open.mapquestapi.com/tigerviewer/index.html?zoom=12&lat=41.47058&lon=-81.70815&layers=B displayed with relatively high accuracy of what I’ve verified
(red = not verified
green = verified)
However, the TIGER map on mapquest would change any way to green that had been edited in any way since the TIGER import. In many cases, I or another OSM user would make an edit but not necessarily verify, for example, a user or I would split the road, although the ways were still connected together, to verify one part but not the other). This edit would result in both roads marked as edited in the Mapquest TIGER map.

I created my own map and created my osmarender stylesheet to display what streets I and other OSM users have verified within the city of Cleveland. Each way contains multiple tags that describing the way. One of these tags ‘tiger:reviewed’ was automatically added to each way imported from TIGER. It’s a superfluous tag and I and some other OSM taggers around the US have removed the tag from the way to verify the rest of the tags in a way is correct and that the way is in a correct place.

The style was based off a TIGER map on Mapquest which marks in green the roads that have been edited in any way since they were first imported from TIGER and red which have not.

see http://skorasaurus.files.wordpress.com/2011/07/motoways-2011-07-10-100dpi.png to view the map (PNG, 10 MB) of what’s been verified so far by me (and a couple other OSM users), as of July 10, 2011.

The osmarender stylesheet can be found at http://pastebin.com/F87JdPH9