Investigation work for a scheme to transform the A303 near Stonehenge will enter its next phase over the coming weeks.
Highways England says experts will focus on the Countess roundabout area, as they carry out various surveys near the World Heritage Site in Wiltshire.
A night-time lane closure will be in place on weeknights from Monday 7th October as part of the project.
Following the launch of an 18-month procurement process in July, the A303 Amesbury to Berwick Down scheme reached another milestone this week with the conclusion of the six-month Development Consent Order Examination.
The examining authority will now review the DCO application and they have three months to make a recommendation to the Secretary of State for Transport, who is expected to make a decision in spring 2020.
Derek Parody, Highways England Project Director, said:
“Our ongoing survey work in no way pre-empts the outcome of the DCO Examination.
“The surveys are taking place to help bidders with their tenders, ensure there is no delay to the programme and put us in a position to be able to start construction on schedule in 2021, providing consent is given.
“And while the work continues around Countess Roundabout, we’d like to thank local communities and road users in advance for their patience.”