The busy road's being made two lanes in both directions between Segensworth and Titchfield - it's due to take 18 months.
No Dive To Boat Wreck
Officers co-ordinating the search for the missing crew members of the fishing boat 'Purbeck Isle' say they won't be sending divers to the wreck.
The 'Purbeck Isle' went missing off the coast of Weymouth on Thursday 17 May 2012.
As part of the investigation, following the sinking of the 'Purbeck Isle', Dorset Police say they won't commission a dive to the wreck to look for the bodies of the two missing crewmen.
From the investigation so far police say they don't think the two crew men, Robert Prowse, aged 20 from Weymouth, and Jack Craig, aged 21 from Portland, are likely to be with the wreck of the boat.
Senior Investigating Officer Detective Inspector Jez Noyce said:
"We have considered the families' wishes in making this decision today, and there are significant safety concerns with diving to this depth and at this location.
"We hope that members of the public will also respect the families' wishes to leave the wreck as a memorial to their loved ones.
"Our sympathies are with the families of Robert Prowse and Jack Craig as well as the family of David McFarlane whose body has been discovered."
Dorset Police are still investigating what happened. The Marine Accident Investigation Branch is also conducting an independent safety investigation into the causes of the accident.
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