Fire engines, police and ambulances all attended after three crashes were reported on the Donnington Wood roundabout and the Granville roundabout, near Asda in Donnington, on Sunday afternoon.
A woman, who was driving a Polo at the time of the crashes, was freed from the car and airlifted to the Queen Elizabeth Hospital in Birmingham.
A man got out of a white BMW after the crashes, and police are now appealing for information to find him.
West Mercia Police spokesman Sam Cook confirmed that police were looking for the man who left the scene and said: "The first collision occurred just outside the Asda car park. The second collision, with two cars, occurred as the car approached Donnington Wood roundabout.
"Following this collision, a woman in her 60s was trapped in a VW Polo. She was taken to hospital with chest and abdomen injuries. She's in a serious but stable condition.
"No arrest has been made at the moment, we're appealing for witnesses. Anyone who saw the collision or has any information that could help police with their enquiries should call 101 and quote incident 350S of 25 March 2018.
"Alternatively, information can be provided anonymously to the independent charity Crimestoppers on 0800 555 111 or via www.crimestoppers-uk.org"
On Sunday evening Galwyn Gatward said on Facebook: "It was my mum in the smashed up car, fire brigade had to cut her out. She’s been air lifted to QE Birmingham, she’s conscious but has broken ribs and internal bleeding."
The road was closed for two-and-a-half hours following the crashes.