What term describes a roadside appurtenance that meets national crash testing standards?

The term that describes a roadside appurtenance that meets national crash testing standards is the Manual for Assessing Safety Hardware, commonly referred to as MASH. MASH is a comprehensive guideline established to evaluate and ensure that safety devices such as guardrails, crash cushions, and barriers meet rigorous crash performance criteria. The publication provides methodologies for testing and evaluating roadside safety hardware to determine their effectiveness in reducing injury and fatality rates in vehicle crashes.

Choosing MASH as the correct answer is grounded in its recognized role in establishing safety standards in transportation infrastructure. It specifically outlines the performance and structural requirements that safety hardware must fulfill to be considered compliant, allowing for a clear understanding of the levels of crash protection offered by these devices. While other terms like "Enhanced Safety Measure," "Safety Compliance Standard," and "Accredited Device" may relate to safety protocols or general compliance concepts, they do not specifically refer to the detailed guidelines and standards set forth by MASH for assessing roadside safety hardware.