Police are appealing for information after a single-car crash at Haute Croix in the early hours of Monday morning that left the female driver with life-threatening injuries.
A grey VW Golf hit the embankment at around 03:45. No-one else was in the car or involved in the collision.
The woman was taken to A&E and remains in hospital.
Anyone who saw what happened or has any information is asked to call police on 612612, Crimestoppers anonymously on 0800 555 111 or via the anonymous online form.

New website helps children and families navigate the digital world
More time in Jersey for French day-trippers
Rapist jailed more than two decades after his crime
Jersey Airport to see 20,000 passengers in the run up to Christmas
Both winning CI Christmas Lottery Tickets sold in Jersey
Jersey churches host free Christmas events in the Royal Square
Support service set up for carers of people with mental illness
New Jersey Opera House CEO appointed