Nepal’s First Road Tunnel Is Almost Here: Nagdhunga-Sisnekhola Set for Historic Opening

Nepal is days away from opening a project that could reshape travel at the capital’s western gateway: the Nagdhunga-Sisnekhola tunnel, the country’s first road tunnel, is set to be formally inaugurated this Monday. Built to ease traffic between Kathmandu and Dhading, the tunnel is being positioned as one of Nepal’s most important transport upgrades in years.

Recent visuals from the site show the tunnel and the Balambu flyover fully illuminated with newly installed streetlights, giving the entire corridor a finished, ready-for-service look. The project began construction in October 2019 and has now reached the point where the government is preparing to put it into operation after years of work.

A landmark for Nepal’s road network

The tunnel connects Sisnekhola in Dhading with Totipakha in Chandragiri municipality in Kathmandu, cutting through one of the most congested and difficult stretches of the Tribhuvan Highway. It is intended to reduce travel time, improve safety, and ease the long-standing bottlenecks at Nagdhunga, a critical entry point into the Kathmandu Valley.

Earlier reports describe the tunnel as a major breakthrough for Nepal’s infrastructure ambitions, with the main passage stretching roughly 2.7 kilometers and accompanied by a separate evacuation tunnel and supporting road structures. The project also includes flyovers, box culverts, underpasses, and other works designed to improve traffic flow along the route.

What the opening means for commuters

For drivers, the biggest change will be speed and predictability. The current road section is known for steep bends, congestion, and delays, especially during peak travel periods and holiday movements. Once fully operational, the tunnel is expected to shorten the route and sharply reduce the time needed to cross the Nagdhunga corridor.

The opening is also likely to improve road safety by diverting traffic away from the most hazardous section of the highway. That should be especially important for heavy vehicles and long-distance transport moving between Kathmandu and western Nepal.

Built with international support

The tunnel has been developed with Japanese technical involvement, reflecting a broader pattern of infrastructure cooperation between Nepal and Japan. Reports have placed the project cost at around Rs 22 billion, making it a high-profile investment in the country’s transport future.

Authorities have also signaled that the tunnel will not be treated as a simple ribbon-cutting moment. The opening is expected to be followed by close operational monitoring, which means the first phase may focus on testing traffic management, safety systems, and the tunnel’s day-to-day performance before it becomes a fully mature transport corridor.

Why this project matters

This is more than just a new road. It is Nepal’s entry into a new phase of tunnel-based highway infrastructure, and it sets a precedent for future projects in similarly difficult terrain. For a country where mountain roads often determine how people, goods, and emergency services move, the impact could be significant.

If the tunnel performs as expected, it could become a model for how Nepal tackles congestion-prone gateways in the years ahead. For now, the focus is on the inauguration, the final preparations, and the moment the country officially begins using its first modern road tunnel.