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where the main road is one-way]]

A one-way street is a 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.


REASONS FOR BEING ONE-WAY

  • Street is too narrow for movement in both directions-in this case parking will only be allowed on one side of the street or not at all.

  • To prevent drivers from cutting through a residential street to bypass Traffic Lights or other things that require vehicles to stop.

  • Part of a One-way Pair of two parallel one-way streets in opposite directions.

  • For a proper functioning of a system of paid parking or other paid access.



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:
  • personnel

  • a Turnstile ; Turnstile Jumping is possible

  • a High Entrance/Exit Turnstile (HEET)

  • a door or gate that can only be opened from one side (a manual or electric lock, or simply a door that is pushed open and has no doorknob on the other side), or automatically opens from one side; with help from someone on the other side, it can usually conveniently be passed in the "wrong" direction. Examples:

  • ---entrance of a shop

  • ---an Emergency Exit ; it may activate an alarm, useful both for proper and improper use of the door

  • an Escalator ; the escalator can be passed in opposite direction, climbing up or down the stairs faster than it moves

  • a one-way Revolving Door


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).