भारतातील सर्वात लांब महामार्ग बोगदा कोणता आहे?

The 9.02 km Atal Tunnel under the Rohtang Pass, opened in October 2020, is the world's longest highway tunnel above 10,000 feet and India's longest highway tunnel among the options. It links Manali with the Lahaul–Spiti valley.