A Teenage moped rider was left seriously injured after being mown down by a hit-and-run driver.
The 17-year-old was hit by a Volvo car in Hawthorn Avenue, Bognor, at 7.30pm on Sunday.
The male driver left the scene and police are attempting to track him down, while the teenager is in a serious but stable condition in St Richard's Hospital, Chichester.
Sussex Police said the car is believed to be silver or beige 440 model and is likely to have been damaged in the accident.
The hit and run was one of almost a dozen serious accidents on the county's roads during a weekend which stretched emergency services.
It came the day after a 13-year-old boy died in a three-car smash on the B2104 Hailsham Road at Stone Cross, and just hours after a driver was killed and a 19-year-old man was left fighting for his life when their car burst into flames after hitting a tree on the A26 Eridge Road in Crowborough.
A man died and a woman had to be flown to hospital after a motorbike and a car collided earlier on Sunday.
The accident involving the Honda motorcycle and a Ford Ka happened on the A267 between Five Ashes and Mayfield, just before 5pm.
The 34-year-old motorcyclist died at the scene. A 21-year-old woman who was riding pillion was flown to the Kent and Sussex Hospital in Tunbridge Wells with serious leg injuries. The two occupants of the car suffered minor injuries and were treated at the scene.
Meanwhile, the driver of a Ford Mondeo was taken to hospital after a collision with a Saab on the B2123 Falmer Road, Brighton, at around 12.30am on Sunday.
Two hours later a pedestrian suffered serious injuries in a collision with a car in Willingdon Road, Eastbourne, near the junction with Park Lane.
Another motorcyclist suffered serious injuries and was taken to hospital after crashing on the A29 at Bury Hill, near Pulborough, just after 2pm on Sunday.
Superintendent Paul Morrison, of Sussex Police road policing department, said: "There are a whole raft of factors which push up accidents, so I would urge drivers to do all they can to stay safe.
"The main three points are a reduction in speed, to always wear a seatbelt and not to allow yourself to become distracted by things like mobile phones.
"People also need to leave time for the journeys so they are not in a rush and plan in for possible delays."
Supt Morrison said figures for January to March last year showed 38 per cent of all collisions in Sussex involved drivers aged between 17 and 24.
He said: "We are not shifting the blame to any particular group but lack of experience is often a vital factor in road accidents."
Police are appealing for witnesses to all the incidents.
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