Experimental traffic calming has been installed in Lewes Road, Ridgewood, Uckfield.
The works are associated with housebuilding on the Ridgewood Farm site and are being paid for by the developer.
Ways to make the road safer past the site entrances have been debated for many months with plans being brought forward and rejected.
The measures were installed yesterday (September 11).
UckfieldNews.com was told by the county council: “The traffic calming associated with this development has yet to be fully agreed, but we have held meetings with the town council, emergency services and bus company to discuss the various options.
“As a result a temporary extension of the 30mph speed limit and temporary traffic island have been installed for up to six weeks so we can assess how these work in practice before any permanent changes are made.
“We will assess the impact of these temporary measures and meet again with partners before making any decision on permanent measures.”
During a later phase of the housebuilding, two full-sized roundabouts on the western side of the development will be constructed.
One will be on the A22 Uckfield by-pass and the other close by, but on the housing estate itself.
The county council said: “All of these measures are being paid for and built by the developer and the county council’s role is to work with the developer and help them to find a suitable traffic calming scheme.”