The Sunmai-Rajduwali Road Tunnel is planned to connect points on the Mechi Highway, improving traffic flow hindered by steep and rugged terrain, difficult geomorphology, unstable geological conditions, and limited road-widening options. Quality, Research and Development Center, Department of Roads, Chakupat, Lalitpur is responsible for development of the project.

ChesCo-PNet-WELINK JV have conducted a complete feasibility study and design of road to determine the economic viability and technical feasibility of constructing this tunnel.