Hai Van Tunnel 2 in central Vietnam has opened to traffic Monday after four years of construction.
Connecting Thua Thien-Hue Province with central hub Da Nang, the tunnel of 6.2 km (3.85 miles) is the longest road tunnel in Southeast Asia and helps reduce traffic pressure on Hai Van Tunnel 1.
The new, 7-meter-wide, two-lane tunnel runs along tunnel 1 on National Highway 1A, part of the Hai Van Pass, 500 meters above sea level, which is the natural boundary between Thua Thien-Hue and Da Nang. Nang.
As an investor by Deo Ca Group Joint Stock Company, the project was started in 2016.
Cost VND8.51 trillion (US$367 million), made using Vietnamese techniques.
Engineers are only allowed to use explosives twice a day at certain times so as not to disrupt traffic along the Hai Van 1 tunnel, just 30 meters away.
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