A woman was airlifted to hospital and 11 people suffered minor injuries when a minibus overturned on the M6 motorway in Staffordshire.
It is thought it collided with the central reservation near junction 15 southbound, near Stoke-on-Trent.
Firefighters had to cut the woman out while the others passengers were treated for bruises and cuts by paramedics at the scene..
One lane was closed causing delays but has now reopened.
The injured woman, believed to be in her 60s, suffered a lower leg injury and a laceration to her head, West Midlands Ambulance Service said.
She was airlifted to University Hospital North Staffordshire for further treatment.
Her injuries were not thought to be life threatening.
West Midlands Ambulance Service said: "Eleven other people, men and women believed to be in his 60s, were out of the minibus when crews arrived.
"All had suffered relatively minor injuries ranging from muscular pain, cuts and bruises.
"They were triaged on scene by crews and medics before being taken by land ambulances to Stafford Hospital."
Traffic is now "moving" and the carriageway has been cleared, the Highways Agency said.