Following feedback from drivers Highways England is altering the road markings at the roundabout between 8pm and 6am on Tuesday, 27 October and Wednesday, 28 October.
We always aim to give customers the best possible driving experience on our roads and feedback from drivers indicated that slight alterations might help their journeys.
Alexis Field said:
Improvements worth £3.27 million were recently completed at the roundabout and while the road markings passed our safety checks, drivers told us changes might help them navigate the roundabout and that is why we are carrying out the work.
Significant work such as this often requires some fine tuning and we hope the alterations will help everyone using this section of the A38.
On the southbound approach of the A388 Callington Road, traffic destined for Saltash will be directed to the right hand lane, and the road markings on the roundabout amended to guide drivers through.
On the westbound exit on to the A38, the markings will be altered to provide more guidance for merging traffic.
Work at Carkeel Roundabout included widening the westbound approach from 2 to 3 lanes and widening the westbound exit to allow for a 2 lane exit. A pedestrian footbridge on the A38 eastern arm was also installed.
In the long term, the improvements will increase traffic flows and reduce overall queue lengths at the roundabout and achieve wider benefits in supporting growth in the surrounding area, such as development at Carkeel and Saltash.
A planned second phase of works, being undertaken by Cornwall Council, either side of the roundabout will further improve the operation of this part of the road network.
While the road markings are being altered some closures will be needed. A fully signed diversion route will be in place advising drivers to use B3271.
Members of the public should contact the Highways England customer contact centre on 0300 123 5000.
Journalists should contact the Highways England press office on 0844 693 1448 and use the menu to speak to the most appropriate press officer.