Expendable Barrier

These include fences, traffic barriers, and crush barriers. Soft barriers are devices such as light curtains. They detect the presence of a foreign body and are tied into the control circuit to stop the machine.Safety barriers are physical or non-physical means planned to prevent, control, or mitigate undesired events or accidents. Barrier systems may be classified according to several dimensions, for example as passive or active barrier systems, and as physical, technical, or human/operational barrier systems.The purpose of a barrier is to prevent the penetration of an area by intruders. However, as most barriers can be defeated with sufficient time and resources, then the purpose of a barrier is to delay the progress of the intrusion sufficiently for a response team to intercede and apprehend the intruders.