Road users are being urged to exercise caution due to a fallen tree on overhead power lines in the Antrim Road area of Glengormley.
A Department for Infrastructure spokesperson said: “Fallen tree lying on overhead power lines. The A6 Antrim Road off Sandyknowes Roundabout is down to a single lane.
“Road users are advised to exercise caution. Power NI have been advised. HGVs could be at risk. Delays possible during morning rush hour.”