# The Traffic Signs Regulations and General Directions 2016, Paragraph 6

Extent: E+W+S

Letters, numerals or other characters must not have an x-height of—
(a) less than 35 mm, or
(b) more than 400 mm.

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Source: https://www.legislation.gov.uk/uksi/2016/362/schedule/13/part/9/paragraph/6 (the official version)
Page: https://openlegislation.uk/traffic-signs-regulations-and-general-directions-2016/schedule-13/part-9/paragraph-6
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.