The West Sussex County Times reports:
Southbound traffic will be diverted onto the newly constructed carriageway in two phases, with the first planned in early July and the second at the end of July.
During the month, the southbound entry slip road at the Handcross junction — which has been closed since February while it was be rebuilt and improved — will be re-opened.
The work will be carried out overnight, between 8pm and 6am, and only one carriageway will be closed at a time. Dates will be publicised of the closures nearer the time.
Clearly signed diversions will be in place via the A264, A24 and A272.