(1) The Authority may, subject to the provisions of sub-section (2) make such modification Jn the Regional Plan as fina1ly prepared by it, as It may think fit, being modif\catlons which, in Its opinion, do not effect important alterations in the character of the Regional Plan and which do not relate to the extent ofland-uses or the standard of population density.
(2) Before making any modifications in the finally prepared Regional Plan, the Authority shall publish a notice, in such fonn and in such manner as may be prescribed, indicating there In the modifications which are proposed to be made in the finally prepared Regional Plan, and Inviting objections and suggestions from any persons wtth respect to the proposed modifications before such date as may be speclfled In the notice and shall consider all objections and suggestions that may be received by it on or before the date so speClfied.
(3) Every modification made under thls section shall be published in such a manner as the Authority may specify and the modifications shall come into operation either on the date of such publication or on such later date as the Authority may fix.
(4) If any question arises whether the modifications proposed to be made are modifications which effect important alterations In the character of the Regional Plan or whether they relate to the extent of land-uses or the standard of population density, it shall be decided by the Authority, whose decision thereon shall be final.