the above was from natural causes, and the hillside they came tumbling off of appears to be about 150 feet higher than the road
Good video views of the hillside and work underway to clear potential problem rock, and likely, to set up ledge/shelves to catch any small falling rock
http://www.11alive.com/story/news/traffic/2016/03/05/southbound--75-reopen-st-patricks-day/81389248/
http://www.knoxnews.com/news/local/tdot-emergency-contract-let-for-i-75-rock-slide-cleanup-2cf1a2d3-313c-231d-e053-0100007f9556-370568821.html
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