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Los Angeles, California
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Completed in 1949, the Four Level Interchange in Los Angeles was the world's first stack interchange, revolutionizing how highways intersect.
Approximately 500,000 vehicles navigate this complex interchange each day, making it one of the busiest in the United States.
In 1999, the American Society of Civil Engineers recognized it for its innovative design and impact on transportation.
It connects four major freeways: US 101, I-110, SR 110, and I-5, facilitating seamless travel across Los Angeles.
Its iconic structure has been featured in productions like 'Speed' and 'Lethal Weapon 3,' showcasing its architectural significance.
The construction required innovative techniques to manage the complex layering of roads and ensure structural integrity.
Its construction was a key component of the 1947 California Freeway and Expressway System plan, aimed at modernizing transportation.
