Highways England have declared a major incident on the M27 near Southampton.
Hampshire police have closed all lane in both carriageways with all traffic being stopped between Junction 5 and Junction 7
A number of emergency service resources have been sent to the scene that was declared just before 10pm on Thursday evening.
A spokesman for Highways England said: The Westbound carriage is closed due to person jumping from an over bridge. Officers from Hampshire police have been called and are at the scene. The spokesman refused to confirm if the person involved had been injured as a result of the fall.
UPDATED: Full statement from Highways
The M27 is currently closed from J7 to J5 with delays of at least 30 minutes for approaching traffic on the westbound carriageway. This closure is due to a police led incident and Highways England has resources deployed working to assist the police.
For traffic approaching the closure locally, you are advised to expect disruption with extra journey time and may potentially have to re-route your journey.
If travelling towards this area from much farther afield, you may wish to change your strategic route, allow extra travel time and follow guidance from our on-road variable message signs and media.
Diversion route details and guidance is as follows;
Leave at J7 to follow the hollow black square diversion route, via the A334 Charles Watts Way, proceeding onto the A27 for approximately 2 miles to Wide Lane. Continue on Wide Lane (A335) to return to the M27 at J5.
More to follow