Two cars were involved in a crash on the southbound M5 near Thornbury earlier this morning.
The vehicles overturned in the incident which occured at around 6.30am, between junction 14 for Thornbury and junction 15 at the Almondsbury interchange.
Emergency services and a team from Highways England attended the scene.
The road is now fully reopen, but drivers are being told to expect long delays.
One vehicle remains on the hard shoulder awaiting recovery.
Motorists are advised to approach the area with caution.