Bottleneck 'could be eased with £290m dualling'published at 07:20 Greenwich Mean Time 29 January 2018
Highways England plans to dual the eight-mile (13km) stretch between the roundabouts at Carland Cross and Chiverton Cross.
If the plans are agreed, it will cost £290m and will open by late 2022.
Business leaders believe better roads and a reduction in queuing traffic could help to boost the economy.
Hauliers have welcomed the plans saying it should cut costs.