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An obstacle (also called a barrier, impediment or stumbling block) is an object, thing, action or situation that causes an obstruction. There are, therefore, different types of obstacles, which can be physical, economic, biopsychosocial, cultural, political, technological or even military. ==Physical barriers== As physical obstacles, we can enumerate all those physical barriers that block the action and prevent the progress or the achievement of a concrete goal. Examples: * architectural barriers that hinder access to people with reduced mobility; * doors, gates, and access control systems, designed to keep intruders or attackers out; * large objects, fallen trees or collapses through passageways, paths, roads, railroads, waterways or airfields, preventing mobility; * sandbanks, rocks or coral reefs, preventing free navigation; * hills, mountains and weather phenomena preventing the free traffic of aircraft; * meteors, meteorites, micrometeorites, cosmic dust, comets, space debris, strong electromagnetic radiation or gravitational field, preventing a spacecraft from navigating freely in space. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「obstacle」の詳細全文を読む スポンサード リンク
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