Kathmandu, June 2, 2025
The long-awaited Nagdhunga Tunnel, Nepal’s first road tunnel designed as a major infrastructural component, is nearing completion. This project promises to significantly reduce travel time and alleviate the chronic traffic congestion on the Nagdhunga–Naubise section, offering much-needed relief to travelers.
A Shared Struggle for Commuters
For decades, the winding roads and frequent traffic jams along the Nagdhunga–Naubise section have been a shared ordeal for commuters. The narrow, serpentine stretch often takes hours to navigate, especially during peak hours or when accidents occur. Social media has been flooded with stories from frustrated travelers, like journalist Shaligram Nepal, who recently described being stuck for 12 hours on a route that typically takes 4-5 hours.
The completion of the Nagdhunga Tunnel is expected to change this narrative. By directly connecting Sisnekhola and Tutipakha, the 2.7-kilometer tunnel will shorten the route by approximately 8 kilometers, enabling vehicles to cover the distance in just 3-5 minutes.
Advanced Features and Safety Measures
The tunnel is equipped with state-of-the-art safety systems, including:
A parallel evacuation tunnel located 30 meters away for emergencies.
Fire hydrants and 15 jet fans for smoke and dust management.
Emergency doors every 375 meters to facilitate quick exits during crises.
The evacuation tunnel, though functional, remains unfinished with a rough ceiling and walls, highlighting its role as a secondary route for emergencies.
Economic and Technological Investment
Constructed at an estimated cost of NPR 22 billion, the project has been primarily funded by a concessional loan of NPR 16 billion from the Japanese government at an interest rate of 0.01%. Nepal’s government has contributed an additional NPR 6 billion. The project was delayed by factors including the COVID-19 pandemic and land acquisition challenges, extending the original 42-month timeline to 53 months.
The tunnel, constructed by Japan’s Hazama-Ando JV, incorporates a unique steel flyover and a three-lane approach road that connects Balambu to the tunnel entrance. Service lanes ensure accessibility for local communities.
Future Implications
The Nagdhunga Tunnel marks the beginning of a new era in Nepal’s road infrastructure. It sets a precedent for future projects like the six tunnels proposed for the Kathmandu-Terai Fast Track and ongoing work on the Siddhababa Tunnel along the Siddhartha Highway.
However, questions remain about the cost of toll fees, as the government prepares to hand over tunnel operations to the private sector. Vehicle owners will need to pay fees at counters set up at both ends of the tunnel.
A Symbol of Progress
While Nepal has long utilized tunnels for hydropower projects, such as the 27-kilometer water tunnel from Helambu to Sundarijal, the Nagdhunga Tunnel is the country’s first significant road tunnel. It is not only a technological achievement but also a symbol of Nepal’s growing capability to undertake ambitious infrastructure projects.
As the government prepares to open the tunnel to traffic later this year, it stands as a testament to the potential of international cooperation and innovative engineering to transform Nepal’s transportation landscape.
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