The A75 Hardgrove to Kinmount scheme is attracting keen interest with five bidders set to compete for the £20 million work.
The five companies bidding for the project are: McLaughlin & Harvey Ltd, Balfour Beatty Civil Engineering Ltd, John Paul Construction, I & H Brown Ltd and RJ McLeod (Contractors) Ltd.
The work involves building just over two miles of new road to provide alternating overtaking facilities in both directions.
Transport Minister Keith Brown said:
“The Scottish Government has been clear in its commitment to improving the A75 and we welcome this keen interest from the construction industry. It is through projects such as this that we can support employment opportunities during the construction phase while providing benefits for road users.
“Together with A75 Dunragit Bypass and A77 Symington to Bogend Toll schemes announced in July, we can clearly demonstrate our very real efforts to improve connectivity and make Scotland an attractive option for business, leisure and tourism.
“Upon completion, the scheme will benefit users by improving the performance and safety on this stretch of road, increase the number of overtaking opportunities and provide better facilities for the needs of cyclists and pedestrians."
Construction is expected to start in 2013 and be completed in 2014.