The busy road's being made two lanes in both directions between Segensworth and Titchfield - it's due to take 18 months.
Cars Vandalised In Portsmouth
A 31 year old man has been arrested after 50 cars were damaged in around seven hours.
Several cars parked in Watts road, Turner road and Wingfield Street had their tyres slashed between midnight and 7am on Saturday morning.
Police have been patrolling the streets where the attacks took place.
The Force says they would like to speak to anyone who was in the area at the time and saw something suspicious.
Anyone with information or who wishes to report damage is being asked to call Hampshire Police on 101.
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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