Key Points Introduction Tunnel Impact and Sustainability Tunneling Methodologies Excavation Support Tunneling Costs ADB Strategy 2030,VII. Examples of Low-Cost Rural Tunnels References,1 1 1 2 2 2 6 7 9 10,Contents,II. KeyKPeoyinPtosints,1,From an environmental point of view, a tunnel can greatly reduce emissions, noise and vibration, and light pollution and has a minimal impact on the local flora and fauna below which it passes, avoiding disturbance to sensitive hillside ecosystems, cultural he
