In slippery wintry weather, a motorist lost control of his vehicle and ended up leaving the carriageway and careering into a ditch at around 8.15pm near Sedgemoor Services.
Police said none of the three occupants – a mother, child and a male driver – was seriously hurt.
The southbound carriageway was not closed during the incident. The Highways Agency was called to ensure the safety of those at the scene.
