LONDON - MAY 29:  A London Bus near Big Ben on May 29, 2011 in London. The London Bus service is one of the largest urban bus networks in the world with 8,000 buses covering 700 routes.
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LONDON - MAY 29: A London Bus near Big Ben on May 29, 2011 in London. The London Bus service is one of the largest urban bus networks in the world with 8,000 buses covering 700 routes.