475m tunnel.
https://en.vietnamplus.vn/hanoi-inaugurates-new-road-tunnel-to-address-traffic-congestion/239523.vnp
The capital city of Hanoi officially opened the Le Van Luong - Belt Road No. 3 tunnel to traffic in the morning of October 5, part of the city's moves to address traffic congestion.
https://en.vietnamplus.vn/hanoi-inaugurates-new-road-tunnel-to-address-traffic-congestion/239523.vnp
Hanoi inaugurates new road tunnel to address traffic congestion | Society | Vietnam+ (VietnamPlus)
en.vietnamplus.vnThe capital city of Hanoi officially opened the Le Van Luong - Belt Road No. 3 tunnel to traffic in the morning of October 5, part of the city's moves to address traffic congestion.