A new six-lane stretch of motorway in Wales could end up costing more than £1 billion.
The planned M4 relief road, south of Newport, aims to ease congestion and improve journey times for drivers.
In November 2015, First Minister Carwyn Jones said the project would cost "nowhere near" £1 billion.
But revised estimates, including an additional 10 new bridges along the proposed route, suggest the road could cost £1.1 billion to complete.
The total cost of construction is projected to be £857 million, with l and and compensation costs of £92 million. P roject "risk" is estimated at £106 million.
It comes as officials launch a consultation on the compulsory purchase of land, which is an important step to launching a public inquiry.
One of the bridges would carry the M4 over the River Usk, while the other 34 would allow the new motorway to pass over or under side roads.
Ministers will be unable to give the road the green light until after the assembly election on May 5. It could be open by autumn 2021, with work potentially starting in spring 2018.
Copyright Press Association 2016. Motoring News articles do not reflect the RAC's views unless clearly stated.