http://www.legislation.gov.uk/ukpga/1980/66/section/105DHighways Act 1980An Act to consolidate the Highways Acts 1959 to 1971 and related enactments, with amendments to give effect to recommendations of the Law Commission.1981-03-01texttext/xmlenStatute Law Database2026-03-18Expert Participation2026-03-13 PART VA<Strong><Addition ChangeId="d29p7752" CommentaryRef="c13422031">ENVIRONMENTAL IMPACT ASSESSMENTS</Addition></Strong><Addition ChangeId="d29p7752" CommentaryRef="c13422031"><Addition ChangeId="d29p8571" CommentaryRef="c19486021">Validity of decisions</Addition></Addition>105D1If a person aggrieved by a decision of the project authority to proceed with the construction or improvement for which an environmental statement has been made desires to question the validity of the decision on the ground that—ait is not within the powers of this Act; orbany requirement of this Part of this Act has not been complied with in relation to the decision;he may, within 6 weeks from the date on which the decision is first published under section 105B (6), make an application for the purpose to the High Court.2On any such application, the Court—amay by interim order suspend the operation of the decision, or any aspect of it, either generally or in so far as it affects any property of the applicant, until the final determination of the proceedings; andbif satisfied that the decision is not within the powers of this Act, or that the interests of the applicant have been substantially prejudiced by a failure to comply with any requirement of this Part of this Act, may quash the decision or any aspect of it, either generally or in so far as it affects any property of the applicant.3Subject to subsection (2), a decision to which subsection (1) applies shall not be questioned in any legal proceedings whatever.Pt. VA substituted (13.3.1999) by S.I. 1999/369, reg.2S. 105D inserted (26.4.2007) by The Highways (Environmental Impact Assessment) Regulations 2007 (S.I. 2007/1062), reg. 5 (with reg. 7)Words in s. 105D(1) substituted (5.12.2017) by The Environmental Impact Assessment (Miscellaneous Amendments Relating to Harbours, Highways and Transport) Regulations 2017 (S.I. 2017/1070), reg. 1(1), Sch. 2 para. 7 (with Sch. 6 para. 6)S. 105D(1) modified (1.4.2018) by The Sub-national Transport Body (Transport for the North) Regulations 2018 (S.I. 2018/103), regs. 1(2), 12(e)Pt. 5A power to amend or repeal conferred (26.12.2023) by Levelling-up and Regeneration Act 2023 (c. 55), ss. 164(3), 255(5), Sch. 14 Pt. 1 (with s. 247)