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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.

A common market was launched on 1 January 2008 with plans to realize a fully integrated single market. It eased the movement of goods and services. However, implementation lagged behind after the 2009 financial crisis. The creation of a customs union began in 2003 and was completed and fully operational on 1 January 2015. In January 2015, the common market was also further integrated, allowing full equality among GCC citizens to work in the government and private sectors, social insurance and retirement coverage, real estate ownership, capital movement, access to education, health and other social services in all member states. However, some barriers remained in the free movement of goods and services. The coordination of taxation systems, accounting standards and civil legislation is currently in progress. The interoperability of professional qualifications, insurance certificates and identity documents is also underway. Gulf Cooperation Council (GCC), political and economic alliance of six Middle Eastern countries—Saudi Arabia, Kuwait, United Arab Emirates, Qatar, Bahrain, and Oman.