# The Traffic Signs Regulations and General Directions 2016, Paragraph 13

Extent: E+W+S

The sign may only be placed—
(a) to indicate the point at which a recently imposed speed limit of 30 mph begins on a road—
(i) on which there is a system of carriageway lighting furnished by lamps lit by electricity and placed not more than 183 metres apart in England and Wales or not more than 185 metres apart in Scotland; and
(ii) which had previously been subject to a higher speed limit;
(b) as near as practicable to the point the recently imposed speed limit begins;
(c) if that point could not otherwise be indicated by virtue of Schedule 10; and
(d) during the period of six months beginning with the day on which the 30 mph speed limit comes into force.

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Source: https://www.legislation.gov.uk/uksi/2016/362/schedule/13/part/12/paragraph/13 (the official version)
Page: https://openlegislation.uk/traffic-signs-regulations-and-general-directions-2016/schedule-13/part-12/paragraph-13
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.