A good cyclone barrier around yards that have pets and small children can keep the animals from wandering off and keep other dangers from being able to get into the yard. People with small children that have an area fenced off so that the child does not have the ability to run onto the street rest more easily when their children are outdoors. Some people do actually get steel security fencing in front of their homes. This is generally done in areas where the danger of a vehicle leaving the roadway and driving onto the property is high.
Steel security fencing is actually strong enough to stop a car where wooden fences, and fences made of lighter gauge metals, will not stop a car. If there is a remote possibility that a car could leave the road and run onto your property then having steel security fencing will give you higher levels of security.
Steel security fencing cannot be cut with a set of bolt cutters like lighter gauge fencing materials can. Some fences are made from materials that are so light that the average person with a pair of bolt cutters, or wire cutters, can cut their way through them in a matter of minutes. Sometimes they can do this and put the material back so closely that it is not obvious that the enclosure has been breached. With steel security fencing around the perimeter of your land you will not worry that anyone will be able to cut their way in easily.
Most of the time these barriers are constructed to keep people off of the property when the property owner is not with them, this is done to reduce the risk of theft, and vandalism, on commercial properties. When you make it harder for a thief to be able to steal the things that you have the insurance companies charge you less money to insure your belongings, this is because you become less of a risk. The amount of money that you save on your insurance the first year will more than likely cover the additional cost of having the heavier fencing placed around the business.
Barriers that keep people from breaking in and stealing things can also keep trespassers from being on the property. Trespassing is not really a serious crime except that when a person is trespassing and they become injured they can sue the property owner for their injuries. If you have a barrier up it becomes obvious to people that they are not allowed there without permission and if they do get on your land and get hurt it is their own fault.