A junction is being built to accommodate a new quarry site near Chichester.
The improvements, outside the Kingsham Quarry site in Hunston Road, will make it safer for pedestrians and cyclists to cross the road.
It will provide a right turn lane for HGVs to stop them holding up traffic in either direction when accessing the site.
Other features include:
- Hunston Road widened;
- Extended footway/cycleway on Hunston Road;
- New pedestrian island to make it safer to cross;
- Street lighting;
- Resurfacing of existing carriageway; and
- Improved drainage.
Work has started on the scheme and is expected to last for about five weeks.
A temporary speed limit of 30mph is imposed during construction.
Motorists are advised to allow extra time for their journey and to consider alternative routes.
Hunston Road northbound will be closed overnight between Wednesday, June 15 and Wednesday, June 22.
An approved diversion route will be in place via Hunston and Donnington during the closure.
Dudman Group Ltd, leaseholder for the quarry site, is funding and constructing the junction.
West Sussex County Council will monitor the works and the flow of traffic.