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The strategic national corridors were established in 2009 to define the transport links over which the largest proportion of strategic traffic—that is traffic travelling between the 10 largest urban areas, 10 busiest ports and seven busiest airports in England—moves around the country. The strategic national corridors are therefore defined by the places they connect and the size of traffic flows using them rather than by road classification. A road could become part of the strategic national corridor if the total or HGV traffic flows grew to be within the top 20% for GB trunk roads in England, or if the Department for Transport were to change the criteria used to define the SNCs. The Government have no current plans to review the criteria for the strategic national corridors.