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Located on the northern tip of the Macau Peninsula, it is known by the Barrier Gate separating Macau from mainland China. The Portuguese built the gate in 1849 to replace a crumbling wall that the Chinese erected during the Ming dynasty in 1573. [1] [2] The Chinese built a garrisoned wall to control the flow of people and goods. [3]
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Manual gates are sometimes hung in the manner of a normal gate (i.e. hinged horizontally). In some places, bar gates are installed across suburban streets as a traffic calming measure, preventing through traffic, while allowing authorised vehicles such as emergency services and buses to take advantage of the shorter and more direct route.
A border barrier, border fence or border wall is a separation barrier that runs along or near an international border. Such barriers are typically constructed for border control purposes such as curbing illegal immigration , human trafficking , and smuggling .
Barrier troops, blocking units, or anti-retreat forces are military units that are located in the rear or on the front line (behind the main forces) to maintain military discipline, prevent the flight of servicemen from the battlefield, capture spies, saboteurs and deserters, and return troops who flee from the battlefield or lag behind their units.
Vehicle barrier at the US Mexico border, 2010 Physical barriers such as security fences, walls, and vehicle barriers act as the outermost layer of security. They serve to prevent, or at least delay, attacks, and also act as a psychological deterrent by defining the perimeter of the facility and making intrusions seem more difficult.