 Consider again the case of Garner v Burr (above, section 2.2). The term ‘vehicle’, as properly understood for the purposes of the Road Traffic Act, is vague if there are borderline cases for its application (cases in which it is unclear whether the term applies to some object). It may seem that nothing is more patently a borderline case of a ‘vehicle’ than a chicken coop on wheels. But we should bear in mind that (if the discussion in section 2.2 above is sound) the correct application of the term depends on legal principles relating to the purposes of the legislation and to the need for clarity in criminal liabilities. So the chicken coop on wheels is a borderline case if it is unclear whether those principles required the provision to be applied to it. And the application of the term was indeterminate in the case, if those principles did not require a decision one way or the other. Of course, the appeal court held that a conviction was required—which we might say amounts to a decision that the term applied to the chicken coop on wheels. The magistrates and the appeal court disagreed about it, but that disagreement in itself does not mean either that the application of the term was determinate or that it was indeterminate. And the fact that the appeal judges seem to have thought that the term clearly applied to the chicken coop cannot tell us that the application of the term was determinate.