It did not take long for California's new freeways to become jammed with cars. This is a shot of the Arroya Seco Parkway (Pasadena Freeway) at the Figueroa Tunnels in February, 1941.
Photo, U.S. National Archives.
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Bos, Carole "California Traffic Jam - 1941" AwesomeStories.com. Publication Date. Date of Access.