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Boulevard Périphérique
Boulevard Périphérique ((:bulvaʁ peʁifeʁik)), sometimes called Périph', is a controlled-access dual-carriageway ring road in Paris, France. One of the busiest roads in Europe, the Périphérique is the generally accepted boundary between the city of Paris proper and its suburbs. With a few exceptions (see ''Structure and Layout''), it is situated along Paris's administrative limit.
The speed limit is 70 km/h (45 mph). Each ring generally has four traffic lanes, with no hard shoulder. At junctions, circulating traffic in the rightmost lane (separated from the other lanes at this point by a continuous white line to the left) must yield priority to entering vehicles.
When travelling at the legal speed limit, it takes around 30 minutes to complete a full circuit.
==History==
Construction of the Périphérique was begun in 1958 on the former site of the Thiers Wall (the last remaining of the city walls of Paris). Destruction of this obsolete structure in the 1920s left a clear ring of vacant land surrounding Paris, which at first was claimed by slums and squatters. In order to alleviate traffic congestion, the Boulevard was planned along this land, and completed on 25 April 1973 under the presidency of Georges Pompidou. Providing a route for a quarter of all Parisian traffic movements, it quickly became the busiest road in France. It became a victim of its own success with widespread congestion, while the dense urban area surrounding it prevents its expansion.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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