# The Road Vehicles (Display of Registration Marks) Regulations 2001, Paragraph 2


When the registration mark is illuminated during the hours of darkness, the characters on that plate must appear white against a black background.

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Source: https://www.legislation.gov.uk/uksi/2001/561/schedule/2/part/3/paragraph/2n3 (the official version)
Page: https://openlegislation.uk/road-vehicles-display-of-registration-marks-regulations-2001/schedule-2/part-3/paragraph-2n3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.