Get access to latest Afghanistan bridge tunnel tenders and bids. Find business opportunities and government contracts for Afghanistan bridge and tunnel tenders, Afghanistan bridge construction tenders, Afghanistan tunnel construction tenders, bridge tenders, tunnel tenders, Afghanistan tunnel work tenders, Afghanistan steel bridge work tenders, structure work tenders, tunneling work tenders. Find Afghanistan bridge tunnel bids, tenders, procurement, RFPs, RFQs, ICBs. The economy of Afghanistan has steadily improved in the last decade due to the return of a large number of wealthy expats, the modernization of the nation's agriculture sector, and the establishment of more trade routes with neighboring and regional countries. The billions of dollars in international assistance that came from expats and outside investors saw this increase when there was more political reliability after NATO became involved in Afghanistan's reconstruction. The nation's GDP (PPP) stands these days at about $70 billion with an exchange rate of $20 billion (2017), and the GDP per capita (PPP) is about $2,000. It imports over $6 billion worth of goods but exports about $1 billion worth of legal products, mainly fruits and nuts. A bridge is a structure built to span a physical obstacle (such as a body of water, valley, road, or rail) without blocking the way underneath. It is constructed for the purpose of providing passage over the obstacle, which is usually something that is otherwise difficult or impossible to cross. There are many different designs of bridges, each serving a particular purpose and applicable to different situations. Designs of bridges vary depending on factors such as the function of the bridge, the nature of the terrain where the bridge is constructed and anchored, and the material used to make it, and the funds available to build it. A tunnel is an underground passageway, dug through the surrounding soil/earth/rock and enclosed except for entrance and exit, commonly at each end. A pipeline is not a tunnel, though some recent tunnels have used immersed tube construction techniques rather than traditional tunnel boring methods. A tunnel may be for foot or vehicular road traffic, for rail traffic, or for a canal. The central portions of a rapid transit network are usually in the tunnel. Some tunnels are used as sewers or aqueducts to supply water for consumption or for hydroelectric stations. Utility tunnels are used for routing steam, chilled water, electrical power or telecommunication cables, as well as connecting buildings for convenient passage of people and equipment.