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spaghetti junction

noun
  1. an interchange, usually between motorways, in which there are a large number of underpasses and overpasses and intersecting roads used by a large volume of high-speed traffic
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Word Origin

C20: from the nickname of the Gravelly Hill Interchange, Birmingham, where the M6, A38M, A38, and A5127 intersect
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012