لخّصلي

Tunnels are more economical than open cuts beyond certain depths ?In the most congested urban area, underground railways or highways is the best alternative to provide means of transportation.In case of aerial warfare and bombing of cities, the tunnels would grant better protection as compared to bridges ?Tunnels allow rapid and unobstructed transport facilities in big congested cities.Tunnels prove to be cheaper than bridges or open cuts to carry public utility services like water, sewer and gas ?if tunnels are provided with easy gradients, the cost of hauling is decreased ?Tunnels protect the system (railway track, highway, sewer line or oil line etc.) for which it is constructed from weather effects such as snow, rain etc.??????????

Tunnels are more economical than open cuts beyond certain depths
 Tunnels avoid disturbing or interfering with surface life and traffic
during construction
 Tunnels prove to be cheaper than bridges or open cuts to carry public utility services like water, sewer and gas
 if tunnels are provided with easy gradients, the cost of hauling is
decreased
 In case of aerial warfare and bombing of cities, the tunnels would grant better protection as compared to bridges
 Tunnels allow rapid and unobstructed transport facilities in big congested cities.
 Tunnels protect the system (railway track, highway, sewer line or oil line etc.) for which it is constructed from weather effects such as snow, rain etc. Thus tunnels reduce the maintenance cost of the system.
 Tunnels avoid troubling to surface life and traffic during construction.
 Tunnels protect the system from destruction due to bombarding during
war time.
 In a certain place, tunnels have proved cheaper for crossing the mountain or river than open cut or bridges.
 In the most congested urban area, underground railways or highways is
the best alternative to provide means of transportation.
 In soft-rocked hill, construction of the tunnel has proved cheaper than open cut due to a large number of the slips etc.
 It avoids the long circuitous routes around a mountain or spur.
 Tunnel avoids the dangerous open-cut very near to the structure.
 Tunnels have proved cheaper to carry public utility service like water, gas, sewer etc.
 Tunnels if provided with easy gradient, the cost of hauling are reduced