There is queuing traffic and a road block after an accident involving 7 vehicles on the A30 Westbound at Jamaica Inn Road, Bolventor.
Cornwall Fire & Rescue said, "Members of the public travelling on the A30 at this time are advised of numerous collisions in the area, Fire, Police and Ambulance are on scene."
"Please travel at cautionary speed and be aware of conditions."
The A30 Westbound has been closed due to a medical emergency between the Chiverton Cross Roundabout and the A3047 (Scorrier).
Emergency services are dealing with an issue about a mile south of Chiverton.
Western Road in Launceston is closed westbound after a serious accident. Police say a car left the road and hit trees near Two Bridges.
The driver was left with serious injuries.
Motorists are advised to avoid the area if possible.
The A30 in Cornwall is closed westbound due to a serious accident between the A3047 at Scorrier and the A3047 at Redruth.
It follows a collision between a lorry and a woman pedestrian near the Avers overbridge. She has been seriously injured.
The road has been closed at Chiverton Cross and is likely to be closed for some time.