The eastbound carriageway of the A14 has been closed following an accident involving two cars and a lorry.
Police were called to a stretch of the road at junction 28, near Fenstanton, following reports that a lorry and two cars had collided and blocked the carriageway.
There are delays reported back to junction 25 at Hemingford.
A spokesman for Camnbridgeshire police said there were no serious injuries reported but that the carriageway would have to be closed while recovery took place.
Motorists are being advised to avoid the area.