...covered by its surveyors. Tele Atlas Asia-Pacific director of operations Arnout Desmet, said in an e-mail, roadinformation changes between 10 to 15 percent each year, and more so in busy urban areas. He said updates are pushed out...
http://news.zdnet.com/2100-9595_22-337891.html
i have read this information wich is referenced "Sullivan, D. 2006. Nielsen / NetRatings Search Engine Ratings. 2006, 1 June.", on a submitted paper but i haven't found it on Nielsen website. please, can someone submit its associated link. a more recent information is desirable. thank's.
http://forums.searchenginewatch.com/showthread.php?threadid=22585