is no substance in the argument that the claim of the pavement dwellers to put up constructions on pavements and that of the pedestrians to make use of the pavements for passing, re-passing, are competing claims and that, the former should be preferred to the latter. No one has the right to make use of a public property for a private purpose without the requisite authorisation and therefore, it is erroneous to contend that the pavement dwellers have the right to encroach upon pavements by constructing dwellings thereon. Public streets, of which pavements form a part, are primarily dedicated for the purpose of passage and, even the pedestrians have but the limited right of using pavements for the purpose of passing and re-passing. So long as a person does not transgress the limited purpose for which the pavements are made, his use thereof is legitimate and lawful. But, if a person puts any public property to a use for which it is not intended and is not authorised to use it, he becomes a trespasser. The common example which is cited in some of the English cases, for example, Hickman v. Maisey [(1900) 1 QB 752] is that if a person, while using a highway for passage, sits down for a time to rest himself by the side of the road, he does not commit a trespass. But, if a person puts up a dwelling on the pavement, whatever may be the economic compulsions behind such an act, his user of the pavement would become unauthorised.