TSM 2008 states that is street lighing ends there should be a repeater sign within 100m then at regular intervals.
http://www.dft.gov.uk/pgr/roads/tss/tsm ... apter3.pdfSpeed limits signing starts page 106 (hint type 106 in the page no then hit enter)
paragrapg 14.22 page 117
Quote:
14.22 Where a 30 mph speed limit is imposed on a
road without street lighting, it is necessary to make
an order. In this case 30 mph repeater signs must be
provided (direction 11(2)). Where a road subject to
a 30 mph limit has street lighting for only part of
its length, it is recommended that the first repeater
sign for the unlit section when leaving the lit
section should be placed at a distance of not more
than 100 m from the last street lamp. Where two
consecutive street lamps within a system of street
lighting are more than 183 m apart (185 m in
Scotland) repeater signs should be provided on the
section of road between the two lamps. That part
of the road must also be covered by a speed limit
order as it is not a “restricted road” (see para 14.21).
Please not that TSM itself is not law, it is best practice guidance based on the law TSRGD 2002
ie didection 11(2) of the TSRGD 2002
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Speed limit sign radio interview. TV
Snap Unhappy“It has never been the rule in this country – I hope it never will be - that suspected criminal offences must automatically be the subject of prosecution” He added that there should be a prosecution: “wherever it appears that the offence or the circumstances of its commission is or are of such a character that a prosecution in respect thereof is required in the public interest”
This approach has been endorsed by Attorney General ever since 1951. CPS Code