The is a twin-bore motorway tunnel on the Chūō Expressway located on the border of the cities of Kōshū and Ōtsuki in Yamanashi Prefecture, Japan. It is located about west of the capital Tokyo. It was built in 1977.Martin Fackler (2 December 2012), Nine Killed When Highway Tunnel Collapses in Japan New York Times
Ceiling collapse At approximately 8 am on December 2, 2012, nearly 150 concrete ceiling panels inside the Tokyo-bound Sasago Tunnel collapsed, crushing three vehicles, including a van, carrying six persons, that caught fire. (フジニュースネットワークニュース2012年12月02日11:04配信(配信日に閲覧)) The fallen panels were thick and weighed each. The caved-in point was from the Tokyo-side exit and spanned a length of . Smoke could be seen billowing from the Kōshū entrance to the tunnel.
Nine people died and two were injured, making it one of the deadliest roadway accidents in Japanese history. The tunnel was closed for a period of 27 days for repairs and removal of ceiling panels, before the south tube reopened on December 29. The north tube, where the collapse happened, reopened on February 8, 2013.
The nature of the collapse closely resembled a similar ceiling collapse in the Fort Point Channel Tunnel in Boston, Massachusetts in 2006.
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