speed limit

This term is primarily used in legal and regulatory contexts to denote the maximum velocity permitted by law. It carries a strong connotation of authority and enforcement, often appearing in discussions regarding traffic safety, fines, and road signage.

In technical or engineering contexts, the term shifts from a legal constraint to a physical or structural boundary. Here, it describes the threshold beyond which a system may suffer mechanical failure or instability, moving the nuance from "forbidden" to "unsafe" or "impossible."