Drainage works are taking place between Randolphs Copse and Pyecombe.
Work is due to be complete at the beginning of June.
Meanwhile, A23 major improvement works continue between Handcross and Warninglid.
A reduced 40mph speed limit and narrow lanes are in place 24 hours a day.
For further details of this scheme visit: http://www.highways.gov.uk/roads/road-projects/a23-handcross-to-warninglid/