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.
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"If you have any information which could help the police investigation please get in touch giving the reference 5222024532."
There are still some delays on the route, but all lanes have now reopened.
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