# The Rules of the Air Regulations 2015, Paragraph 21: Signals visible from the ground

Extent: E+W+S+N.I.

Black, Arabic numerals in two-figure groups and, where parallel runways are provided, the letter or letters L (left), LC (left centre), C (centre), RC (right centre) and R (right), placed against a yellow background, indicate the direction for take-off or the runway in use.

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Source: https://www.legislation.gov.uk/uksi/2015/840/schedule/1/paragraph/21 (the official version)
Page: https://openlegislation.uk/rules-of-the-air-regulations-2015/schedule-1/paragraph-21
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.