Overnight work on a motorway starts on Monday (march 19).
The Highways Agency is extending the southbound slip road of the M23 at junction nine near Crawley.
The aim is to improve the flow of traffic on the main carriageway at busier times of the day.
The slip road will be closed overnight for a 1.5 mile section on approach to the junction, along with lane one and the hard shoulder to provide a safe working area.
The work will take place overnight to avoid disruption and diversions will be in place.
The improvements are expected to be finished by April 14.
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