An Infiniti sedan struck a cement median and became airborne before coming to rest in a field at the northwest side of the new roundabout at 232 Street and 56 Avenue on Thursday night.
Langley RCMP said that the driver, a 35-year-old Surrey woman, was airlifted to hospital with serious injuries.
Langley Traffic Services Collision Analyst and ICARS (Integrated Collision Analysis Reconstruction Services) collected evidence at the scene, including measurements and photographs.
The crash occurred shortly after 11 p.m. and closed the intersection until approximately 4:20 a.m. on Friday.
The Infiniti was seized and will undergo a mechanical inspection.
Speed and alcohol have not been ruled out.
Police have learned from witnesses at the scene that an unidentified motorist may have witnessed the collision but left before police arrival. Police want that witness to contact them at 604 532-3200.