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Recent authors have addressed the Reichenbach assertions that the one-wayvelocity of light, OWVL, cannot be measured because we lack a method tosynchronize distant clocks, and that one needs OWVL to synchronize distantclocks. Thus, one may have any OWVL provided it is greater or equal to c/2 andthe round-trip velocity is c, and, since clocks can be synchronized only bylight signals, clock synchronization depends on whatever OWVL happens to be. Ishow that the Dragowski and Wlodarczyk proposal to use transverse Dopplershifts to measure one-way velocities cannot succeed. In fact, OWVL ismeasurable in a synchronization-free manner by determining the minimumwavelength transmitted by an airgap optical barrier. OWVL along threenon-coplanar axes is required to determine that OWVL is c. Also, contrary tothe Thyssen claim that distant simultaneity is conventional, I show that, usinga moving clock, relativistic time-dilation allows the synchronization ofisochronized stationary clocks without knowing OWVL and also allows,separately, the measurement of OWVL. A burst of unstable particles is asuitable moving clock. Thus, one-way velocity and synchronization are shown tobe independent concepts. The wavelength transmitted by an airgap and the decayof unstable particles have been neglected regarding OWVL, but all experimentsin these areas have found the one-way velocity of light is c.

Special Relativity Teaches the One-Way Velocity of Light Is Measurable  Without Synchronized Clocks and Clocks Are Synchronizable Without One-Way  Signals