Emergency services are on the scene after a BMW crashed into the treeline on the southbound slip at junction 3 for Waterlooville.
One lane has been closed by police while the vehicle is being recovered.
Posting on Twitter about the incident, @HantsPolRoads said: ‘A3M at J3, waterlooville is very busy.
‘Southbound on slip closed for an accident and hulbert road down to one lane whilst recovering the second accident.’
More to follow.