Barrier

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

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.

Static barriers

 * Fitch Barrier, a plastic barrel filled with sand or water, used on highways as an impact attenuator
 * Vehicle barriers (crash barrier), used to keep vehicles within their roadway such as the Concrete step barrier, Cable barrier, Constant slope barrier, F-Shape barrier or Jersey barrier
 * Guard rail
 * Gravel moat for vehicles
 * Water obstacle
 * Bollard
 * Green separation (soft barrier)
 * Traffic slowing measures, such as speed ramps (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
 * Electronic people barriers