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One-way traffic (oruni-directional traffic) istraffic that moves in a single direction. Aone-way street is astreet either facilitating only one-way traffic, or designed to directvehicles to move in one direction. One-way streets typically result in highertraffic flow as drivers may avoid encountering oncoming traffic or turns through oncoming traffic. Residents may dislike one-way streets due to the circuitous route required to get to a specific destination, and the potential for higher speeds adversely affectingpedestrian safety. Some studies even challenge the original motivation for one-way streets, in that the circuitous routes negate the claimed higher speeds.[1]
Signs are posted showing which direction the vehicles can move in: commonly an upward arrow, or on aT junction where the main road is one-way, an arrow to the left or right.[2] At the end of the street through which vehicles may not enter, aprohibitory traffic sign "Do Not Enter", "Wrong Way", 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, another portiontwo-way. An advantage of one-way streets is that drivers do not have to watch for vehicles coming in the opposite direction on this type of street.
A number of European countries, includingRussia andpost-Soviet states, use one-way rectangular road signs with a white arrow on a blue background. In Russia and post-Soviet countries, such signs are called as "Exit to a one-way road" (Russian:Выезд на дорогу с односторонним движением) and are placed in front of an intersection, often in combination with aYield sign orPriority road sign.[3]
Rectangular one-way traffic signs in different countries of the world may have such inscriptions inside the arrow:
In Russia and post-Soviet countries, the "End of one-way traffic" (Russian:Конец дороги с односторонним движением) sign is used to indicate the end of a one-way road.[4] This sign shows a big white arrow crossed out by a red diagonal line on a blue background. Such sign in this form is not found anywhere else in Europe and Asia.
The abstract "No Entry" sign was officially adopted for standardization at theLeague of Nations convention in Geneva in 1931. The sign was adapted from Swiss usage, derived from the practice of former European states that marked their boundaries with their formal shield symbols. Restrictions on entry were indicated by tying a blood-red ribbon horizontally around the shield.[5] The sign is also known asC1, from its definition in theVienna Convention on Road Signs and Signals.
The European "No Entry" sign was adopted into North American uniform signage in the late 1960s / 1970s, replacing a previous white square sign bearing only the English text in black "Do Not Enter". In addition to the standardized graphic symbol, the US version still retains the wording "Do Not Enter", while the European and Canadian versions typically have no text.
SinceUnicode 5.2, theMiscellaneous Symbols block contains the characterU+26D4 ⛔NO ENTRY, representable in html as⛔ or⛔.
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One-way streets may be part of a one-way system, which facilitates a smoother flow of motor traffic through, for example, a city center grid; as in the case ofBangalore,India. 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 may be simpler and may be coordinated to produce agreen wave.
Some of the reasons one-way traffic is specified:
Successful one-way streets typically have "couplets" within close distance. This creates a pair of streets with similar design features to balance travels in both directions. However, it can create a problem if one street in the pair is a major traffic generator, which will create an imbalance.[9]: 761
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One-way street systems often result in an increase in the trip length due to extra turns must be made before reaching the destination. Another major impact is to transit routing. Bus routes must split onto two separate streets, adding to confusion and walking distances. Business owners often object to building one-way streets too, fearing a decline in the business due to changing circulation patterns, though most studies show one way streets in commercial area result in an enhanced economic activity.[9]: 762
In the United States, 37 states andPuerto Rico allow left turns on red only if both the origin and destination streets are one way. See South Carolina law[10] Section 56-5-970 C3, for example. Five other states – Alaska,Idaho,Michigan,Oregon, andWashington – also allow left turns on red into a one-way street from a two-way street.[11][12][13][14]
An attempt was apparently made in 1617 to introduce one-way streets in alleys near theRiver Thames inLondon by The Worshipful Company of Carmen who were commissioned by the King to regulate traffic in the square mile of the City of London.[15][16] The next one-way street in London wasAlbemarle Street in Mayfair, the location of theRoyal Institution. It was so designated in 1800 because the public science lectures were so popular there.[17] The first one-way streets inParis were the Place Charles de Gaulle around theArc de Triomphe,[18] theRue de Mogador and theRue de la Chaussée-d'Antin, created on 13 December 1909.[19]
According to the folklore ofEugene, Oregon, the use of one-way streets in the United States started in Eugene itself. In 1941 6th Ave was converted into a one-way avenue by the Highway Department.[20] Other sources claim the fad arose in relation to the disaster of theSSMorro Castle. On 9 September 1934, the on-fireSSMorro Castle was towed to the New Jersey shoreline near the Asbury Park Convention Center and the sightseeing traffic was enormous. The Asbury Park Police Chief decided to make the Ocean Avenue one-way going north and the street one block over (Kingsley) in one-way going south, creating a circular route. By the 1950s this "cruising the circuit" became a draw to the area in itself since teens would drive around it looking tohook up with other teens. The circuit was in place until the streets went back to two way in 2007 due to new housing and retail development.[21]
Sometimes one-way walking is specified for smooth pedestrian traffic flow, or in the case of entrance checks (such asticket checks) and exit checks (e.g. the check-out in ashop). They may be outdoors (e.g. an extra exit of azoo), or in a building, or in a vehicle (e.g. atram). In addition to signs, there may be various forms and levels of enforcement, such as:
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 apay 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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One-way traffic | |
| In Unicode | U+26D4 ⛔NO ENTRY |
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| Different from | U+2296 ⊖CIRCLED MINUS U+229D ⊝CIRCLED DASH |
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