What is not true about upstream buffering?

• A. Reduces potential blast pressure
• B. Slows the approach of a threat
• C. Separates transition area from separation area
• D. Protects the downstream area

Answer: (C)

Upstream buffering is meant to mitigate a threat before it reaches the protected area. By placing barriers and creating distance upstream, it reduces the blast energy that makes it downstream, and it also adds delay, which helps slow any approaching threat. Protecting the downstream area is the core purpose, keeping people and property safer.

The idea that upstream buffering separates the transition area from the separation area isn’t a typical function of this measure. Zoning or area separation is handled by other protective design elements, not by upstream buffering itself.