The Baguashan Tunnel, on Provincial Highway No. 76, Taiwan, transverses Baguashan (八卦山) between Lincuo IC. (林厝交流道) and Zhongxing JCT. (中興系統交流道). The length of the north tube for westbound traffic is 4928m. The length of the south tube for eastbound traffic is 4935m. Connecting Yuanlin, Changhua and Caotun, Nantou, its opening significantly reduced the travel time between Changhua and Nantou.It was the longest highway tunnel in Taiwan when opened to traffic in April 2005, until the top rank moved to Hsuehshan Tunnel in National Highway No. 5 in June 2006. It is now the second longest highway tunnel in Taiwan.HistoryOn 15 November 1996, construction started.On 5 October 2000, a civil house above the tunnel collapsed and the work stopped for one year.On 29 April 2005, the tunnel opened to traffic in the first step. Only small vehicles were allowed. A truck over 3500 kg in gross weights and a bus with 10 or more seats including the driver were prohibited while the authorities were not ready to deal with emergencies involving large vehicles.On 5 September 2005, the first vehicular accident occurred. The supposedly drunk driver hit the sidewall in the tunnel and caused a vehicular fire.On 1 January 2006, the tunnel opened to buses.On 1 January 2007, the tunnel opened to trucks less than 21 tons in gross weights.Related informationLanes: The tunnel has two lanes in each of the two tubes.Speed limit: 80 km/hConstructing authority: Directorate General of Highways are still remain banned.