Highways England has launched a consultation on the widening of the A12 which is open for comment until 16th August 2021. Residents can find out more at the link below which includes (towards the bottom of the page) a virtual exhibition and 'fly through' of the various areas and junctions and will show you how to comment if you wish to do so.
There are also a number of webinars and physical meetings which you can attend shown on the page.