169. The applicant and the planning authority or the Commission shall comply with the relevant law transposing the Seveso III Directive in the case of development or proposed development—
(a) for the purposes of the provision or modification of a major accident establishment within the meaning of the Seveso III Directive, or
(b) within the vicinity of such an establishment, having regard to the effect that a major accident is likely to have on the area within which the development or proposed development is, or is proposed to be, situated.