This blog is available to provide answers to questions that 20's Plenty for Us get asked by those campaigning for 20mph limits.
Often the same questions will be repeated and this blog should provide a useful resource for those interested in the topic.
More information is available at our websites listed on the right.
Wednesday, 20 August 2014
Speed Limits and Street Lighting
What are the rules about 30mph limits and street lighting?
The 30mph speed limit that applies
automatically to “restricted roads” is
triggered by there being “three or more lamps throwing light on the carriageway
and placed not more than 183metres apart”.
Where there is no street lighting or
inadequate spacing then in order to set a 30mph limit then the Traffic
Authority needs to implement a Traffic Regulation Oder that specifically sets a
30mph limit. In addition they should also put 30mph repeater signs on such a
road to remind the drivers that in the absence of the lighting or any lighting
at all then a 30mph limit applies.
There may be some debate as to
whether lighting that is permanently turned off is able to “throw light on the
carriageway”. However Traffic Authorities are in a position to make a TRO for
these so that regardless of the lighting a 30mph limit applies by virtue of the
TRO rather than the lighting (or lack of it).
If the Traffic Authority sets a 20mph
limit by means of a TRO then this shall apply regardless of the street lighting
but will require the appropriate traffic calming or repeater signs at regular
Note that where the speed limit is
20mph or less then most warning signs no longer require their own lighting and
many warning signs are not required at all.