# Severn Bridges Act 1992, Paragraph 3


(1) In constructing the new bridge the Secretary of State shall provide headway of not less than 377 metres above the prescribed level over a clear central span of at least 415 metres.
(2) In sub-paragraph (1) above “the prescribed level” means 68 metres above ordnance datum (Newlyn).

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Source: https://www.legislation.gov.uk/ukpga/1992/3/schedule/1/paragraph/3 (the official version)
Page: https://openlegislation.uk/severn-bridges-act-1992/schedule-1/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.