# The Motor Vehicles (Designation of Approval Marks) Regulations 1979, Paragraph 14


In the marking relating to item 32 in Schedule 4, there shall be added above the rectangle—
(a) the Roman numeral V, if the window has a regular light transmittance of less than 70%;
(b) the Roman numeral VI, if the window is a double-glazed unit; or
(c) the Roman numerals V and VI separated by a hyphen, if the window is a double-glazed unit with a regular light transmittance of less than 70%.

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Source: https://www.legislation.gov.uk/uksi/1979/1088/schedule/5/paragraph/14 (the official version)
Page: https://openlegislation.uk/motor-vehicles-designation-of-approval-marks-regulations-1979/schedule-5/paragraph-14
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.