I've uncovered and fixed a few errors in my previous estimates of the % of UK roads included on OSM.
I discovered a few days ago that there were a few areas where different boundaries overlapped, with the result that I was double counting some roads in more than one local authority. The problem areas included Rochdale, Thurrock, Stoke and Derby. I think I've fixed them now, and the updated map is here - http://www.reedhome.org.uk/Documents/OSMCover.png Unfortunately I extracted the revised data a day too early to pick up the new admin boundaries in Wales. But at least the data in map and the spreadsheet here - http://www.reedhome.org.uk/Documents/OSMCoverage.csv - is a little more accurate than it was. I've also been experimenting with ways to flag up residential areas that don't seem to have enough roads plotted, and to highlight roads that haven't been fully tagged. My first attempt is crude, but if anyone is interested, the map is here - http://www.reedhome.org.uk/Documents/OSMCover%20with%20extras.png (roads that are only classified as "highway=road" or highway=fixme" are in plotted in black, and the little red splodges show area that are marked as "landuse=residential" but have a very low density of roads within them) I've not forgotten the helpful hints on improving the colour scheme, I still want to find a way to use the NUTS boundaries, I'd like to find a way of speeding the whole process up, and I'll pick up better data for Wales next time. I'd also like to find a way to trim each local authority at the coastline to make it look a bit better... ...but one thing at a time, and it seemed more sensible to fix blatant errors.
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