The M32 is closed northbound between Junction 3 and Junction 2, just north of Bristol city centre due to a collision.
Highways England say the barrier has been damaged and emergency services are at the scene.
Police in Bristol are appealing for witnesses after a man was found injured on the carriageway of the M32 last night.
The man, believed to be in his 40s, was taken to Southmead Hospital with serious injuries where he remains in a critical condition.
It happened at around 11pm near to J3.
Enquiries to establish what happened and how the man was injured are on-going.
A stretch of the M4 near Bristol has recorded some of the fastest speeding motorists in the region.
A Freedom of Information request shows that four drivers were found to be travelling at more than 130 miles per hour between the M32 and the Almondsbury interchange (J20 - J19).
The top speed recorded was 144mph - almost double the 70mph speed limit.
Dorset Police have also reported some high-speed drivers. One incident on the A35 Puddletown Bypass saw a driver reach a limit of 118 mph.
Even more worryingly, the county also reported three drivers who were speeding at more than 75 mph in 30 mph zones.
One lane is closed on the M32 in Bristol inbound due to an accident involving a number of vehicles. That's between Junction 1 (Hambrook) and Junction 2 (Eastville).
A crash involving up to five vehicles has closed one lane on the M32 coming into Bristol.
It's affecting the stretch between J1 (Hambrook) and J2 (Eastville).
Two lanes of the M32 in Bristol are closed this morning following an accident involving a van and a lorry.
It happened on the outbound carriageway between J1 A4174 (Hambrook) and M4 J19 (Bristol). It's causing long delays in the area.
A woman killed after a lorry overturned on the M32 in Bristol has been named as "selfless, loyal and loving" Lorraine Mckeag.
Mrs Mckeag, 60, lived in the Somerset village of Dundry with her husband, whom she cared for after a stroke, and lost in November 2012.
In an emotional tribute released today she is described by her family as kind, popular and active in her community.
Her son James is running the Paris, Manchester and London marathons in memory of his mother, to raise money for the Stroke Association.
Donations can be made here.
The M32 outbound in Bristol has reopened after a lorry overturned, killing a woman driver.
There is queuing traffic between J1 A4174 (Hambrook) and M4 J19 (Bristol). There is also congestion on M32 to J3 (St Paul's roundabout).
The motorway had been closed since 10.45am when a lorry overturned heading onto the westbound M4 entry slip road.