# The Traffic Signs Regulations and General Directions 2016, Paragraph 3

Extent: E+W+S

Where the sign is placed temporarily on a road by a constable or person acting under the instructions (whether general or specific) to the chief officer of police for the purposes of indicating a temporary statutory provision, the diameter may be reduced to not less than 200 mm.

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Source: https://www.legislation.gov.uk/uksi/2016/362/schedule/9/part/8/paragraph/3 (the official version)
Page: https://openlegislation.uk/traffic-signs-regulations-and-general-directions-2016/schedule-9/part-8/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.