The planned Highways England improvements will provide additional capacity, and improve journey times and safety while supporting economic growth in the region.
The existing single carriageway sections will have extra lanes added between Morpeth and Felton and between Alnwick and Ellingham.
Junction upgrades, overtaking lanes and improvements to pedestrian crossings north of Ellingham are also being looked at.
A series of public awareness events about the scheme are taking place later this month, with the first event being held at Morpeth Town Hall on Tuesday, May 17.
Highways England project manager Nanette Hoyle said: “We would really like people to come along to one of the public awareness events which we are holding at different locations along the A1 in Northumberland.
“These events are a chance for local people to meet the project team, find out more about the proposals and give us their feedback on what we have done so far.”
The events will be held on the below dates:
Tuesday (17 May) 2pm – 8pm and Thursday (19 May) 1.30pm – 8pm at: Corn Exchange, Morpeth Town Hall, Market Place, Morpeth, NE61 1LZ.
Wednesday (18 May) – 10am – 7pm at: Bell View, 33 West Street, Belford, NE70 7QB.
Monday (23 May) 11am – 8pm at: St James’s Church Centre, Pottergate, Alnwick, NE66 1JW.
Tuesday (24 May) – 10am – 7pm at: Berwick Town Hall, Marygate, Berwick-upon-Tweed, TD15 1BN.
More details on the A1 scheme in Northumberland are available at www.highways.gov.uk/roads/road-projects/the-a1-in-northumberland.