Serious crash blocked the M4 between Chippenham and Bristol.
The M4 towards Bristol was closed following a serious accident between a car and a lorry.
Reports of long tailbacks in two locations on the diversion route.
The first is on the westbound approach to the Cold Ashton roundabout, where the A420 from Chippenham to Bristol crosses the A46 from Bath to the M4.
The second is on the northbound A46 heading from there to rejoin the M4 in South Gloucestershire.
Two people have been killed in the crash.
The road has been shut westbound between junction 17 and 18 at Bath and is expected to remain that way until 4:30 PM.
More updates will follow.