Wiltshire Police are appealing for witnesses and dash cam footage following an incident in Braydon shortly before 2pm today - 11 May.
A police spokesperson said: "An unknown vehicle is believed to have shed its load of stones on the road which resulted in a driver losing control of their vehicle – a Hyundai I10 - and overturning into a ditch.
"The driver, a woman in her 40s, was fortunately not seriously injured but was taken to the Great Western Hospital as a precaution.
"The road had to be closed for approximately two hours so the carriageway could be safely cleared of stones.
"We would like to hear from anyone who may have witnessed a vehicle shed its load in the area or anyone with dash cam footage of the incident."
Anybody able to help is asked to call 101 and quote crime reference number 54220048500.