Four Level Interchange

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Aerial photo of the Four Level Interchange; the stack configuration of the interchange is readily apparent (downtown Los Angeles is towards the bottom of this image).

The Bill Keene Memorial Interchange, popularly known as Four Level Interchange was the first stack interchange in the world. Opened in 1953 at the northern edge of downtown Los Angeles, California, USA, it connects the Harbor, Hollywood, Pasadena, and Santa Ana freeways. In July 2006, the freeway interchange was officially named The Bill Keene Memorial Interchange, in honor of the late KNX and KNXT traffic and weather reporter, although the new name is rarely used.

The interchange was constructed as a stack interchange because surrounding buildings and terrain made construction of a cloverleaf interchange impractical. Its distinctive architecture has long made it a symbol of Los Angeles' post-World War II development, and it appears on numerous postcards of the 1950s and 1960s.

The interchange was once called The Stacks and the 4-H Interchange, mostly by veteran traffic reporter Bill Keene.

Currently, the interchange comprises the following major highways: