Drivers face delays as preliminary work for the A259 Angmering bypass gets under way.
Traffic controls and speed limits will be in place until the end of the month, when the enlarged roundabout at Roundstone Lane is set for completion.
Improvements are also scheduled for Roundstone Lane itself, including widening and creating new junctions to serve the new housing development.
Work on the bypass itself is due to start in the middle of the year and is due for completion by the end of 2002.
The line of the road has now been fenced off and archaeological investigations are under way.
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