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<p>Average speed limits do not exist but Highways England uses variable speed limits
on smart motorways to smooth traffic flow, reduce congestion and enhance safety. The
variable limits are set locally in response to traffic flow levels or to help manage
incidents.</p><br /><p>The Department issued revised guidance in January 2013 aimed
mainly at local traffic authorities who are responsible for setting speed limits on
local roads. It includes guidance on the use of variable 20 mph speed limits with
electronic signs. It has been designed to help explain to everyone why and how local
speed limits are determined. This guidance was revised following full public consultation
in Summer 2012 and is available online on GOV.UK</p><br />
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