View source for Barrier

A '''barrier''' is a (or barricade) is a physical [[measure]] with the aim to block or impede traffic flows.[[Image:Security barrier at Wellington Monument - geograph.org.uk - 1491330.jpg|thumb|right|300px|Barriers can be shaped into artistic objects (Wellington monument, UK)]]

== Description ==
A barrier as measure is an intentional obstruction of traffic, irrespective of its [[modes of transport|mode]]. A barrier can either by static (in place all the time) or dynamic (able to actively open or close).

Barriers can be labeled hard or soft, depending on the amount of effort it would take to overcome the barrier. This amount of effort can be mode specific; a gravel moat would be very hard to cross by car, but is relatively easy to cross on foot.

== Examples ==
=== Static barriers ===
[[Image:Hydraulic vehicle blocker.jpg|thumb|right|300px|Hydraulic vehicle blocker]]
* [[Wikipedia:Fitch Barrier|Fitch Barrier]], a plastic barrel filled with sand or water, used on highways as an impact attenuator
* [[Wikipedia:Traffic barrier|Vehicle barriers]] (crash barrier), used to keep vehicles within their roadway such as the [[Wikipedia:Concrete step barrier|Concrete step barrier]], [[Wikipedia:Cable barrier|Cable barrier]], [[Wikipedia:Constant slope barrier|Constant slope barrier]], [[Wikipedia:F-Shape barrier|F-Shape barrier]] or [[Wikipedia:Jersey barrier|Jersey barrier]]
* [[Wikipedia:Guard rail|Guard rail]]
* Gravel moat for vehicles
* Water obstacle
* [[Bollard]]
* Green separation (soft barrier)
* Traffic slowing measures, such as speed ramps (soft barrier)
* [[Wikipedia:Crowd control barrier|Crowd control barrier]], a type of temporary fencing
* [[Wikipedia:Mojo Barrier|Mojo Barrier]], a type of temporary fencing used at festivals and concerts

=== Dynamic barriers ===
[[Image:Metcard-barriers.jpg|thumb|right|300px|Dynamic people barriers]]
* [[Wikipedia:Automatic full barriers|Automatic full barriers]], which serve to block roads at railway crossings
* Hydraulic vehicle blockers
* Electronic people barriers

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