Exact solutions for steady flow over thin perforated bridge decks are derived for constant incidence, simple parabolic camber and a general camber shape. Three types of perforations are considered, namely completely open slots, slots with restricted flow due to grills and uniform closely spaced perforations. All of them give similar results for lift and pitching moment, which can be expressed as simple functions of the solidity ratio. These solutions are intended to be the basis on which a study of the unsteady aerodynamic forces can be undertaken, with the object of analysing the flutter characteristics of bridges with perforated road decks.