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A one-way street is a street on which vehicles can only move in one direction. On this type of street a sign is posted showing which direction the cars can move in: commonly an upward arrow, or on a T junction where the main road is one-way, an arrow to the left or right. At the end of the street through which vehicles may not enter, a prohibitory traffic sign "Do Not Enter" or "No Entry" sign is posted, e.g. with that text, or a round red sign with a white horizontal bar. Sometimes one portion of a street is one-way, the other portion two-way. An advantage of one-way streets is that drivers do not have to watch for cars coming in the opposite direction on this type of street. One-way streets may also be part of a one-way system, which facilitates a smoother flow of traffic through, for example, a city centre grid. This is achieved by arranging one-way streets that cross in such a fashion as to eliminate right turns (for driving on left) or left turns (for driving on right). Traffic light systems at such junctions are also simpler. The first one-way street was established in London on 23 August 1617 . Albemarle Street in central London, the location of the Royal Institution, was designated London's first one-way street because the public lectures there were so popular *. The first one-way streets in Paris were the Rue de Mogador and the Rue de la Chaussée-d'Antin, created on 13 December 1909.
Reasons for being one-way One-way traffic of people Sometimes there is one-way walking for people, for smooth traffic flow, or in the case of entrance checks (such as ticket checks) and exit checks (e.g. the check-out in a shop). They may be outdoors, e.g. an extra exit of a zoo, or in a building, or in a vehicle, e.g. a tram. In addition to just signs, there may be various forms and levels of enforcement, such as: Sometimes a "soft" traffic control system is supported by personnel keeping an eye on things. Sometimes a door or gate can be opened freely from one side, and only with a key or by inserting a coin from the other side (house door, door with a coin slot, e.g. giving entrance to a pay toilet). The latter can be passed without paying when somebody else leaves, and by multiple persons if only one pays (as opposed to a coin-operated turnstile). | ||||||||
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