The A30 High Street is closed in both directions due to an overturned car around the B3162 Crowshute Link.
A gas pipe has been damaged. Police advise drivers to use alternative routes.
More top news
The latest forecast for Gloucestershire, Wiltshire, Bristol, Dorset and Somerset with Bob.
The latest forecast for Somerset, Dorset, Cornwall and Devon with Bob.
Poultry farmers across the West Country have been told they must follow strict rules to stop the spread of bird flu.