50-70,000 pieces of British Airways baggage a day travel through these 11 miles of conveyor belts which were installed in a 5-storey underground hall beneath the 400m (a quarter of a mile) length of Terminal 5 at Heathrow Airport. T5 alone has the capacity to serve around 30 million passengers a year and was completed in 2008 at a cost of £4.3bn. The system was designed by an integrated team from the airport operator BAA, BA and Vanderlande Industries of the Netherlands, and handles both intra-terminal and inter-terminal luggage. There are four colour codes: Yellow for out-of-gauge (oversized, like golf clubs); dark blue for not x-rayed; light blue for transfer and red, meaning the item has been subjected to 12 seconds of x-ray scanning. From writer Alain de Botton's book project "A Week at the Airport: A Heathrow Diary" (2009).
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