What is barrier?

What Does barrier Mean

A barrier is a physical obstacle that prevents the passage or access to a site . It is usually a wooden or metal fence that, depending on the needs, is raised or lowered so that you can, or not, advance.

The difference between a barrier and a fence , wire or fence is that the barrier temporarily blocks the passage. These elements have a mechanism that allows them to be moved to clear the way whenever desired.
It is common to have barriers at level crossings (that is, at the point where a railway track intersects a street, highway or other path intended for cars and / or pedestrians). These barriers serve to coordinate traffic : when a train approaches the level crossing, the barrier lowers so that cars cannot cross the track. This prevents accidents. Once the train has passed the level crossing, the barrier rises.

Barriers are also frequently installed at tolls and parking lots . In these cases, the barrier blocks the passage until the driver pays the corresponding fee, either to go through the toll or to enter the parking lot. Upon payment, the barrier is lifted.
Some barriers are manual and require a person to take care of raising and lowering them. Other barriers are automatic and have a system and sensors to function without the need for human intervention.
At a general level, everything that blocks or hinders the progress of something is called a barrier. One may speak of ice barrier , sound barrier , etc. Barrera is also a common surname in several Latin American countries.