A trial judge's finding as to speed based on acceptance of a witness's direct estimate may attract the higher standard of appellate restraint applicable to credibility findings under Robinson Helicopter, rather than the Warren v Coombes standard for inferences from established facts, because estimates of speed involve an intuitive synthesis that the trial judge is better placed to evaluate. Inferred speed calculations derived from imprecise witness estimates of time and distance are an insufficient basis to overturn a trial judge's acceptance of a direct speed estimate, particularly where the underlying variables are hedged with qualification. A cyclist approaching a roundabout is entitled to assume that a driver at a give way sign will give way and is not required to keep the driver under constant observation while attending to traffic from the right to which the cyclist must give way.
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