Hampshire Police say that the A34 is likely to remain closed in both directions for most of the day as repairs are made to the road surface following a serious accident overnight.
It's understood that a transporter lorry hit the central reservation near Whitchurch in Hampshire, causing the cars it was carrying to fall onto both the north and south bound carriageways.
Police and Highways Agency staff have been at the scene since 11:10pm last night.
No one was hurt in the accident and no other vehicles are believed to have been involved.
Drivers hoping to use the A34 today are being advised to take alternative routes.
The A34 southbound is blocked by an overturned boat at Bury Lane, West Ilsley turn-off. The boat fell from a trailer on the M4-bound carriageway.
The northbound A34 is closed this evening after an accident. It happened near junction 13 of the M4. The northbound A34 will be closed for several hours. Diesel has spilled, meaning that resurfacing work must be carried out. Diversions are in operation.
The A34 northbound is blocked,with stationary traffic due to an accident. A lorry and car were involved between the A272 and A303 at Bullington Cross.
There are long delays on the A34 in Oxfordshire today after two crashes closed both carriageways. The first accident involved three cars northbound near the Milton interchange. Just fifteen minutes later a car collided with a motorbike on the other side of the road.
A combine harvester and a lorry have collided on the A35 Southbound, closing the carriageway.Read the full story ›
A cash on the A34 involving a lorry and a combine harvester has closed the Southbound carriageway. Recovery work is continuing this afternoon. More updates later.
There has been a major crash on the A34 southbound after a lorry was in collision with a combine harvester near the Pear tree roundabout.
A crash between a lorry and a combine harvester has closed the A34 southbound. Traffic is backed up after the crash at the Peartree Interchange. All approaches to the roundabout may have to be closed for recovery, but at the moment only the southbound carriageway is affected.