# The Motor Vehicles (Designation of Approval Marks) Regulations 1979, Paragraph 13


The Roman numeral shown outside and above the rectangle in the marking relating to item 31 in Schedule 4 shall be—
(a) II, if the windscreen is made of ordinary laminated glass;
(b) III, if the windscreen is made of treated laminated glass which is not coated; or
(c) IV, if the windscreen is made of plastic glass;
and, in the case of a windscreen made of ordinary or laminated glass which is coated, the Roman numeral shall be followed by “/P”.

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Source: https://www.legislation.gov.uk/uksi/1979/1088/schedule/5/paragraph/13 (the official version)
Page: https://openlegislation.uk/motor-vehicles-designation-of-approval-marks-regulations-1979/schedule-5/paragraph-13
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.