Can it be argued that Ehlers, Pirani and Schild’s generalization of Weyl’s causal-inertial method for determining the spacetime metric constitutes a convention-free, and – in relevant respects – theory-independent body of evidence that can adjudicate between spacetime geometries, and hence between spacetime theories that postulate them? As Weyl showed, we can empirically determine the metric field, provided certain epistemic conditions are satisfied, that is, provided we can measure the co