The work, which is due to last five nights, also includes replacing traffic detector loops, road markings and studs.
The closures take place from 9.30pm to 6am each night, when traffic will be diverted north to the A444 then turn around at the roundabout with the A4114 and return to Festival Island via the southbound A444 and A46.
The work will ensure the continued provision of a safe, smooth carriageway but to carry it out safely and efficiently we need to close the carriageway. We advise road users affected by the diversions to allow extra time for their journeys.
Members of the public should contact the Highways Agency Information Line on 0300 123 5000.
Journalists should contact the Highways Agency press office on 0844 693 1448 and use the menu to speak to the most appropriate press officer.