Brighton MP Simon Kirby chaired the first meeting of the A27 “reference group” as part of a campaign to upgrade the road between Lewes and Polegate.
The reference group was formed to make the case for improving this stretch of the A27.
It will do so while the Highways Agency and the Department for Transport undertake a feasibility study looking at various options.
The Conservative MP said: “The A27 is the transport backbone for East Sussex and for too long we have been left with little more than a country lane to deal with over 25,000 vehicles a day.
“It is unreliable and people consistently rat-run through unsuitable roads to avoid the jams.
“I am pleased to be able to bring together this group to ensure this section of the A27 is at the top of the government’s agenda for improvement.
“By improving the A27 I hope that the traffic situation on other roads in my constituency, notably the A259 South Coast Road, can also be improved.”
East Sussex County Council leader Keith Glazier said: “We need the A27 between Lewes and Polegate to be fit for purpose.
“It is an important part of the strategic road network that has been neglected.”
Councillor Glazier said: “Our businesses tell us that significant improvements will support inward investment and will attract new employees.
“We believe a new dual carriageway will help businesses, residents and visitors move along this vital east-west coastal route.”
The group today agreed to ensure the Chancellor is clear on the benefits of a new dual carriageway.
It also aims to ensure ministers in the Department for Transport and Department for Business, Innovation and Skills are aware of the importance of the A27.
All of those present agreed with the need for a dual carriageway except for Councillor Rosalyn St Pierre.
She was representing Lewes Liberal Democrat MP Norman Baker’s opinion that minor improvements to the existing road would be preferable.
Mr Kirby said that he had written to the Chancellor seeking an urgent meeting and was contacting the Transport Secretary and Business, Innovation and Skills Secretary.