National Highways says diversions are in place, and the roads will reopen at 06:00 GMT on Monday.
A police-led incident on the Avonmouth Bridge has led to long queues on the motorway and other routes.
Two lanes were closed following the incident on the northbound carriageway within J9 Wednesbury and Walsall ...
A serious crash has shut a stretch of the M6 this morning.
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