The northbound Cooper Dean roundabout flyover will be closed overnight for maintenance works on Friday 5 April from 8.30pm to 11.30pm.
Northbound traffic will be diverted down the off-slip, onto the Cooper Dean roundabout and then back onto the A338 on-slip.
The closure will enable regular maintenance work to be carried out on the drains, along the edge of the flyover carriageway. It is being timed to coincide with, and utilise, the current traffic management in the area to minimise disruption say BCP council.