Barrier

A barrier is a (or barricade) is a physical measure with the aim to block or impede traffic flows.

Barriers can be shaped into attractive objects (Wellington monument, UK)

Description

A barrier as measure is an intentional obstruction of traffic, irrespective of its 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

• Fitch Barrier, a plastic barrel filled with sand or water, used on highways as an impact attenuator
• Roadblock, a temporary installation to control or block traffic on a road
• Vehicle barriers (crash barrier), used to keep vehicles within their roadway
  • Cable barrier
  • Concrete step barrier
  • Constant slope barrier
  • F-Shape barrier
  • Guard rail
  • Jersey barrier or K-rail, a type of concrete barrier used to divide highway traffic
  • Gravel moat for vehicles
  • Water obstacle
  • Bollard
  • Green separation (soft barrier)
• Crowd control barrier, a type of temporary fencing
• Mojo Barrier, a type of temporary fencing used at festivals and concerts

Dynamic barriers

• Automatic full barriers, which serve to block roads at railway crossings
• Hydraulic vehicle blockers
  File:Vehicle Blocker CPV-250.jpg

  Hydraulic vehicle blocker
• Electronic person barriers
  

  Dynamic people barriers