Officers from Hampshire police said the crashes caused severe disruption on the M3 northbound.
The first crash, involving three vehicles, was reported at 10.09am between junctions 12 for Eastleigh and Chandler’s Ford and 11 near Winchester on the northbound carriageway.
Minor injuries were sustained in the collision.
A second crash involving four vehicles was then reported at 10.44am in the resulting congestion.
No injuries were reported in the second incident.
One lane of the M3 northbound was closed following the two collisions, causing disruption to motorists travelling along the motorway.
The incidents involved a total of seven vehicles, with emergency services responding to both crashes.
Motorists are advised to approach the area with caution and allow extra time for their journeys.
The full circumstances surrounding both collisions have not yet been confirmed.