Freeways (all pics from lapl.org)
The oldest freeway on the west coast, the Pasadena Freeway (back then called the Arroyo Seco Parkway), 1940
Cahuenga Freeway, 1940s (now part of the Ventura Freeway through the Cahuenga Pass)
Harbor Freeway, 1950s
Hollywood Freeway, 1950
Section of Hollywood Freeway under construction, 1952, looking west from Western Avenue
Aerial view of Hollywood Freeway, 1951. From this view you can see how much was torn down and what a scar it has left.