A driver and an 11-year-old passenger are still serious in hospital after a rush hour crash on Penwortham flyover.
Police are appealing for witnesses to the accident which brought traffic chaos to parts of Preston at rush hour on Friday afternoon.
The pair were trapped in the wreckage of a Vauxhall Vectra car after it collided with two vehicles travelling in the opposite direction on Golden Way, near to its junction with Strand Road. They were released by firefighters and the boy was flown by air ambulance to Alder Hey Hospital in Liverpool with serious head injuries.
The driver, a 52-year-old man, was taken to the Royal Preston Hospital where he underwent surgery for a broken femur and fractured pelvis.
Two other youngsters, both aged 12, were also in the vehicle, but escaped with only bruising.
Sgt Gareth Hill, of South Road Policing Unit, said: “I would appeal for anyone who saw the accident itself or the Vauxhall Vectra in the time before the collision to get in touch with us.”
The main A59 was closed for around four hours after the crash while police carried out an examination of the vehicles and the scene. Delays continued until late into the evening.