The A30 is partially blocked in both directions due to an accident from the Loggans Moor Roundabout to A3047 (Camborne West, Treswithian).
Callers report that the air ambulance is possibly attending the scene. It is understood the incident happened at 9am.
It is not known how many vehicles have been involved or how many people.
It appears that injuries have been sustained as the air ambulance has been seen landing.
It not know at this stage how serious the injuries are or how many people have been injured.
Keep up to date with the latest on this incident in the blog updates below.
The westbound lanes of the A30 have reopened and traffic is easing. The accident, involving a single car, has been cleared.
The westbound carriage of the A30 around the Treswithian area, between Camborne and Hayle, is still closed almost an hour after a single-car accident was first reported.
Callers report that the air ambulance is at the scene. Eastbound traffic is unaffected but traffic is slow with onlookers viewing the accident.
Traffic between Camborne and Hayle is affected.
The A30 Westbound is closed and there is queuing traffic due to a one-car accident from the A3047 Camborne West turn-off to the A30 at Loggans Moor roundabout.