# The Road Vehicles Lighting Regulations 1989, Paragraph 12

Extent: E+W+S

Other requirements–
(a) Except in the case of a motor vehicle first used before 1st April 1986, any other vehicle manufactured before 1st October 1985 and a motor bicycle combination, where two rear position lamps are required to be fitted they shall form a matched pair and where four rear position lamps are required to be fitted they shall form two matched pairs.
(b) In the case of a rear position lamp capable of emitting a flashing light which is fitted to—
(i) a pedal cycle; or
(ii) a trailer drawn by, or a sidecar attached to, a pedal cycle
the light shown by the lamp when flashing shall be displayed not less than 60 nor more than 240 equal times per minute and the intervals between each display of light shall be constant.

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Source: https://www.legislation.gov.uk/uksi/1989/1796/schedule/10/paragraph/12 (the official version)
Page: https://openlegislation.uk/road-vehicles-lighting-regulations-1989/schedule-10/paragraph-12
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.