Relativistic Velocity Addition: A Corrective Overview

It is occasionally (and incorrectly) asserted that summing relativistic velocities—such as 0.8 c + 0.8 c—yields superluminal results (e.g., 1.6 c). In reality, special relativity prohibits any inertial‑frame measurement from exceeding the speed of light. This white paper presents a concise derivation of the correct velocity‑addition law via the Lorentz transformation, outlines step‑by‑step operational guidance, and provides a worked numerical example. The result always remains subluminal (|u| < c).