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Wikipedia: The Four Level Interchange (officially Bill Keene Memorial Interchange) was the first stack interchange in the world. Completed in 1949 and fully opened in 1953 at the northern edge of downtown Los Angeles, California, USA, it connects U.S. Route 101 to State Route 110. In July 2006, the freeway interchange was officially named after Bill Keene, former KNX and KNXT traffic and weather reporter, although the new name is rarely used.
![[Four Level Interchange of Arroyo Seco Parkway and Highway, looking north]](http://images.ookaboo.com/photo/s/Fourlevel_int_12252005_s.jpg "Four Level Interchange of Arroyo Seco Parkway and Highway, looking north")
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