Farrans Roadbridge, John Paul Construction, R J McLeod and Wills Bros have all made the shortlist for the £30M A77 Maybole bypass in Scotland.
The four firms will now enter into competitive dialogue, which will last until autumn 2018. Once the winning bid is chosen, it is hoped construction will start at the end of 2018.
The job will be to construct a new 5km bypass and junctions.
Scotland’s transport minister Humza Yousaf said: “This announcement marks another significant milestone towards delivering a bypass for the town of Maybole and comes hot on the heels of ground investigation work which got underway earlier this month.
“The Scottish Government remains committed to delivering the Maybole Bypass, and recent progress will enable work to press ahead in the New Year to bring much needed relief for the Maybole community as well as improving journey times for long distance road users.”