What best describes an expedient barrier?

An expedient barrier is characterized by its construction from materials that are not specifically designed for barrier purposes but can effectively serve that function when needed. This type of barrier is often assembled from readily available resources, allowing for quick setup in response to emerging threats or scenarios. The focus here is on improvisation and adaptability, making it a practical solution in urgent situations or environments where traditional barriers cannot be utilized.

In the context of this definition, barriers that are permanently installed, easily relocated, or require personnel action to be effective would not fit as expedient barriers. A permanently installed barrier implies a long-term solution that is not adaptable to immediate needs. Barriers that can be relocated quickly using lightweight materials may not inherently be expedient if their primary use is not for creating a barrier. Additionally, barriers requiring action by personnel to function may not provide the immediate security expected from such a setup, particularly in high-stress situations where quick deployment is essential.