One lane is closed on the M5 in Gloucestershire in both directions between junction 12 for Quedgeley and 13 for Stroud after an accident involving two cars and a caravan.
It happened on the southbound side at 5.30am and one of the cars crossed over to the northbound carriageway.
Two lanes re-opened southbound at 10am but there is major congestion as a result of the crash.
There are queues southbound back to junction 11A for the Brockworth bypass and onto the A38.
More top news
Leah Kerry, 15, died after taking a new psychoactive substance in a park in Newton Abbot. Her family have spoken about their grief.
It was a busy weekend in Bristol as crowds gathered for the city's annual Harbour Festival featuring boats, food and musical performances.
Dry and bright for much of the time, rain on Wednesday