Officers have urged witnesses to come forward following a serious incident on the M5.
The motorway was closed between J21 (Weston SuperMare) and J20 B3133 Ettlingen Way (Clevedon) at around midnight and reopened around 7:30am.
An Avon and Somerset Police spokesperson said: "The M5 closure northbound between junction 21 (Weston-super-Mare) and 20 (Clevedon) was lifted at about 7.30am Monday 31 January. It had been closed while emergency services were at the scene of a collision which happened just after 12am.