The busy road's being made two lanes in both directions between Segensworth and Titchfield - it's due to take 18 months.
Dorset Beach Clean Continues
The Dorset Waste Partnership (DWP) will be working with landowners, volunteers and other agencies to coordinate the clean-up of spilt cargo on the Dorset coast today.
They are asking people to help collect and dispose of cargo and other litter on Chesil Beach.
Cigarettes, pet food, sachets of tea and packets of feta cheese and olives have been washed up between West Bexington in the west and Hengistbury Head in the east.
Warnings have been issued to people to not eat any of the food products found on beaches.
Chesil Beach is continuing to see the highest concentration of cargo lost from the Svenborg Maersk container ship during storms in the Bay of Biscay last month.
A container door was also found washed ashore in Bournemouth on Tuesday, 4 March.
The Maritime and Coastguard Agency (MCA) has now reported that a fourth container has been spotted off Start Point in Devon. The contents of this container are as yet unconfirmed, but it could mean more cargo being washed up on Dorset's coast.
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