The air ambulance has landed in a recreation ground in Durrington.
It touched down in Pond Lane recreation park, known to many as The Lamb park, which is opposite what is now The Park View Pub in Salvington Road.
A Sussex Police spokesman confirmed the force had been called to a road traffic collision involving one vehicle in Greenland Road, which is nearby, but could not confirm at this stage if the two incidents were linked.
An eyewitness said the air ambulance left the scene at about 12.15pm.
They said they would provide an update in due course.
South East Coast Ambulance Service confirmed the air ambulance was called to a woman who ran herself over; click here to find out more.