# The Motor Vehicles (Designation of Approval Marks) Regulations 1979, Paragraph 18


In relation to the marking prescribed at item 50, “11” shall appear above the circle where the direction indicator is fitted to the front of the vehicle, “12” shall appear above the circle where the direction indicator is fitted to the rear of the vehicle and “31” shall appear above the circle where the direction indicator is fitted to the side of the vehicle. In the case of a direction indicator which does not on one side attain the minimum luminous intensity prescribed up to a minimum horizontal angle for spacial light distribution H=80° (according to paragraph 7.7.1 of, and Annex 1 to ECE Regulation 50), a horizontal arrow shall appear, the tip of which is oriented to the side where the minimum luminous intensity according to the said paragraph 7.7.1. is complied with up to an angle of at least 80°.

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Source: https://www.legislation.gov.uk/uksi/1979/1088/schedule/3/paragraph/18 (the official version)
Page: https://openlegislation.uk/motor-vehicles-designation-of-approval-marks-regulations-1979/schedule-3/paragraph-18
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.