The "Four Level Interchange" (1954) Opened in 1954, the "Four-Level Interchange" was the first high-speed freeway interchange int he world. The crossing of the Hollywood and Harbor Freeways, it is the central "intersection" of the entire metropolis, standing, appropriately enough, just a few blocks from City Hall Four-Level Interchange, Opening Photo in 1953. Inset: Engineering Model of the Four-Level Interchange 1948. Composition (c) 1998 Philip J. Ethington Credits: California Department of Transportation; Photographic Record of Construction Work, Bureau of Engineering Collection, Los Angeles City Archives (both are public documents and thus not controlled by copyright). (c) 2000 Philip J. Ethington Note: Highways are shown for reference