11.—(1) Prior to the commencement of Works No. 9(c), the details of the boundary slopes within the Order land abutting the M1 motorway (addressing landscaping and ground stability issues) must be submitted to and approved in writing by the relevant planning authority. The development must be carried out in accordance with the details approved from time to time in writing by the relevant planning authority.
(2) The details of the boundary slopes to be approved by the relevant planning authority under this requirement must reflect the preliminary assessment and methodology for geotechnical assessment set out in the Statement of Intent (Document 10.4) unless otherwise agreed in writing by the Highways Agency.
(3) Before approving any details under this requirement the relevant planning authority must first consult the Highways Agency.