The busy road's being made two lanes in both directions between Segensworth and Titchfield - it's due to take 18 months.
Dorset Police Giving Road Safety Advice
Police in Dorset are handing out 20,000 road safety flyers this week.
Half are being given to drivers in the Shaftesbury area as part of an anti-speeding operation on Wednesday.
Messages on them include asking parents of young children to teach them about road safety.
It's part of United Nations Global Road Safety Week - click here for more information.
Police want to trace man after 11-Year-Old Approached Near Oasis Academy
Family Appeal Is Shared Online After 14-Year-Old Missing Since Friday
Exceptionally Rare Locker Key Sells For Record Price At Auction.
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