The busy road's being made two lanes in both directions between Segensworth and Titchfield - it's due to take 18 months.
Strike Day - Marches Across Dorset
The biggest strike in more than 30 years took place on Wednesday, November the 30th 2011, with marches across Dorset including in Bournemouth, Poole and Dorchester.
In total across the country, around 2 million public sector workers walked out in a row over planned changes to their pensions.
Around 170 schools had to shut in Dorset.
There were fears about long queues at immigration at some UK airports, but Bournemouth and Southampton airports said there weren't any problems to report. At Heathrow and Gatwick, passengers said immigration queues were shorter than usual.
Meanwhile, Poole Bridge is expected to be closed to road and pedestrian traffic from 7pm to 11.59pm.
Road signs and variable message signs will be in place to advise motorists.
The normal lifting schedule for Poole Bridge will resume from midnight.
Marches and rallies took place at lunchtime in Bournemouth, Poole and Dorchester with hundreds of workers taking part.
Click here to see a GALLERY OF PHOTO'S from the day.
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