Five people were taken to hospital after a car overturned on the A24 near Ashington in the early hours of this morning (Friday September 6).
Emergency services arrived in London Road just before 1.30am.
One teenage girl was taken to Royal Sussex County Hospital in Brighton with serious injuries.
Another girl and three other teenage boys were taken to Worthing Hospital.
Martin McKilligin, watch commander at Storrington fire station, said all victims were aged around 17 or 18 years.
“The car somersaulted through the bushes and trees before it stopped in the upside-down position,” he told the County Times.
“There was quite a lot of damage to the car.”
No other vehicles were involved in the collision.
The road was closed until about 5am whilst investigations were carried out.
Mr McKilligin explained this collision mirrored a scene from Safe Drive Stay Alive - a Sussex Safer Roads Partnership theatre-styled initiative which targets youngsters at schools and colleges across the county.
He said it had been a ‘bad summer’ on roads in the Horsham district because of the number of fatalities.
“I’ve got two boys,” he continued. “One is 17 and has just passed his tests four weeks ago, and my eldest is 20.
“The last couple of incidents I’ve been to in this area where I’ve known them because they’re their friends. It’s a worry.
“You come home and you think about it being your child.”
He added: “It does play on your mind, we have a lot of strong backing and support at the service but we don’t take it lightly.
“It’s the overall family impact of what’s left behind afterwards, because it goes on and on and on.”