Which of the following is a common feature of physical barriers?

The common feature of physical barriers that stands out is their visibility and access. Physical barriers are specifically designed to control entry to areas, thereby influencing how easily or difficult it is for individuals to enter those spaces. Visibility plays a crucial role in deterrence; if barriers are highly visible, they serve as a clear indication of restricted areas, which can dissuade unauthorized access.

Access is equally important as it determines what kind of traffic is allowed through the barrier—whether it permits entry to authorized persons or restricts access to everyone. This aspect of visibility and access ensures that physical security measures can be both effective and clear to those encountering them, highlighting the intention behind their use.

While height and weight, material and design, and location and type can certainly contribute to the overall effectiveness of a barrier, the overarching qualities of visibility and access specifically relate to how barriers function in securing an area and informing users of their presence and purpose.