I think the most necessary cleanup to the USA OSM data is to clean up all the crazy unedited original Tiger roads.
These can easily be identified simply as those ways that have a name but are still the original Tiger data and have not been edited. (except for the balrog-kun bot). You could just identify spots not closer together than (say) 1 mile and that would allow the editor to have a nice piece of real estate to clean up each time. It is quite fun doing this since (with the help of TIGER 2012) overlay and Bing imagery, it is usually possible to determine which road goes where and you see an enormous improvement in the map for relatively small efforts. If the remap-a-tron identifies an area where all the original; TIGER data was correct, then no problems, we just flag it as good and move on, but at least that area has now been eyeballed by a real person who probably will be able to add in a few new TIGER 2012 roads if they have the overlay active.
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