A series of average speed cameras along the A12 in Essex and Suffolk are operational.
Two schemes monitoring the 70mph speed limit have been installed around Kelvedon, Essex, and along the Hughes Corner stretch on the Essex and Suffolk border around Dedham and East Bergholt.
Work began on the two separate schemes in February and March, and was completed some weeks ago.
Part of the Hughes Corner scheme overlaps with the current resurfacing roadworks, which have a temporary 40mph limit while works are carried out.
Highways England has confirmed the two projects are now live and enforcing the speed limit.
An agency spokesman said: “It is important for road users to respect the speed limits displayed for their own and other people’s safety.”
The Kelvedon scheme has cost £840,000 to install, funded through the last government’s pinch point funding programme, and is designed to make a number of junctions with short slip roads along the stretch of the A12 safer.
Installed for similar reasons, the Hughes Corner scheme cost an estimated £740,000.
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