evidence: Key Points - Shyama Prasad Mukherjee Tunnel: The Chenani-Nashri Tunnel renamed as Shyama Prasad Mukherjee Tunnel. - It is not only India’s longest highway tunnel (9 km long) but also Asia’s longest bi-directional highway tunnel. [...] - The Zojila Tunnel will be Asia’s longest road tunnel, to be built at an altitude of 11,578 m above sea level.