What caused America's DEADLIEST freeway collapse?

A double-decker freeway pancaked onto itself, crushing over 40 people under the mass of its rubble. Now, exactly 30 years later, I dig into an important government report which shows the lessons Civil Engineering has learned -- to ensure the Cypress Freeway Disaster is the last.

Road nerd? Read the full report yourself (State of California):
http://www.dot.ca.gov/hq/esc/earthquake_engineering/seismic_advisory_board/compete_against_time.pdf

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Видео What caused America's DEADLIEST freeway collapse? канала Road Guy Rob