This story is free to read. Photo: Broken semi blocks lane of Highway 27 photo-broken-semi-blocks-lane-highway-27 photo-broken-semi-blocks-lane-highway-27 By Dan Henry January 2, 2014 1 min read Workers wait for assistance after a Transport National semi-trailer failed grounding a large cylindrical load Thursday between the Signal Mountain Road and Manufacturers Road exits southbound on U.S. Highway 27.