A motorcyclist, in his 30s, has been injured in a three-vehicle collision on the A2 Bangor Road, near the Culloden Hotel in Holywood.
The man was taken to hospital with head and leg injuries following the rush-hour crash.
A Belfast Trust spokesperson said he is in a stable condition.
The road has now reopened in both directions but there may still be delays in the area.
There is no further information at this stage.