Firstly - don't listen to those who see blobs of red on OSMI and say "we're all doomed" - This is a very overly pessimistic view.
Instead, have a look at the Cleanmap of, for example, L.A. http://cleanmap.poole.ch/?zoom=11&=&lat=34.04097&lon=-118.05841&layers=B00 It seems that L.A. is almost complete. However this is a slightly optimistic view. Now check out the Badmap http://cleanmap.poole.ch/?zoom=11&=&lat=34.04097&lon=-118.05841&layers=00B Now you see that while L.A. is in pretty good shape, there is, in fact, quite a bit of work to do, especially in the Glendale, Burbank areas. You are very lucky that in the USA you have a clean source of street names (TIGER 2011) so the effort to remap a road is minimal. The simple ones take about a minute, to remove the way plus any intersection dirty nodes, trace in a new one from BING and the TIGER centerline, paste in some source tags and highway=residential tag from a copy buffer and copy in the TIGER 2011 name from the TMS overlay (remembering to un-abreviate as you go). Some roads are (unfortunately) glued to landuse polygons. For these you need to unglue first to make room for the road replacement. These take a lot more time but, hopefully, there are not too many of these. Only retreive clean tags for the way or any nodes. If a traffic signal tag on a node is dirty, just blow it away. Then If you can identify the signals by pavement markings on the BIng imagery, put them in. I'll be doing bits of L.A but will be spending most of my time trying to salvage Australia, so when you've finished the US come help me down here!!
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