Record #00509Transport archive
Mila Mountain Tunnel in Tibet, China, opened on 26 April 2019. Its bores measure 5,727 and 5,720 m and ordinary road portals stand at 4,752 and 4,774 m; local transport authorities described it as the world's highest completed extra-long road tunnel.
Current Record
4774m
Current record value
The tunnel is a critical section of the Lhasa–Nyingchi highway through cold, oxygen-poor mountainous terrain, improving transport between central and eastern Tibet.
The local authority also lists a construction adit opening at 4,889.6 m, but this is not an ordinary road portal. The record uses the higher operational portal at 4,774 m rather than the construction access elevation.
The record conclusion has sufficient verification support.
Basis: direct confirmation by an authority
The Nyingchi transport authority's 26 April 2019 opening release confirms both bore lengths and the ordinary portal altitudes of 4,752 and 4,774 m, and calls it the highest completed extra-long road tunnel. The 4,889.6 m construction adit is not included.
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