Hampshire Police are currently dealing with a serious collision on the M3 northbound.
As a result, all three lanes of the northbound carriageway between junctions 9 and 10 will remain closed for the rest of the afternoon.
The southbound carriageway is also currently closed to provide access to ambulance services. This will be re-opened as soon as possible.
Traffic is currently being diverted to follow the solid diamond symbol:-
Exit at J10 and take the 3rd exit at the roundabout onto the A31 Northbound. At the 2nd roundabout, take the 1st exit onto the A272 (Spitfire Link) Northbound to rejoin the M3 at J9.
Officers will be working with motorists stuck in the heavy traffic, and will seek to divert these people in due course.