Avon and Somerset Police said a section of the motorway in south Gloucestershire is likely to remain closed in both directions until the early hours of Sunday after a body was found between junction 20 around Almondsbury Interchange, and junction 21 near Awkley.
“Road users caught within the closure will be released by turning around under supervision of our traffic officers and police,” National Highways said in an alert.
“For your own safety, that of the emergency services and other road users please do not attempt to turn around until instructed to do so by either police or National Highways traffic officers.”.
The M4 near Bristol is “fully closed” on Saturday night after a dead body was found on the carriageway, police have said.
They added that motorists currently stuck on the M4 will be asked to turn around under guidance from traffic officers and police.
