# The Motor Vehicles (Designation of Approval Marks) Regulations 1979, Paragraph 11


The Roman numeral shown outside and above the rectangle in the marking relating to item No. 2A in Schedule 4 will—
(a) be I if the mirror is an interior rear-view mirror, II if the mirror is an exterior rear-view mirror fitted on a vehicle in category M2, M3, N2 or N3, and either II or III if the mirror is an exterior rear-view mirror fitted on a vehicle in category M1 or N1;
(b) be supplemented by the letter “s” if the mirror is an additional rear-view mirror as defined in Commission Directive 79/795/EEC.

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Source: https://www.legislation.gov.uk/uksi/1979/1088/schedule/5/paragraph/11 (the official version)
Page: https://openlegislation.uk/motor-vehicles-designation-of-approval-marks-regulations-1979/schedule-5/paragraph-11
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.