And her devastated husband saw her car slowly drift across a main road into the path of an articulated lorry causing a head on crash.Paul Lockett was driving ahead of his wife Janes white Kia Sportage car as they headed on holiday to North Devon from their home in Milton Keynes. After an early start to the 150 mile trip, they had nearly reached their destination when it seems his wife fell asleep at the wheel of the car the second identical tragedy in two days on the same stretch of road in the same circumstances. Paul, now 43, told an inquest today (Thursday) the crash claimed the lives of 43-year-old Jane Baker-Lockett and two of his three stepchildren, 12-year-old twins Amy Gaskin and James Gaskin. Paul told the hearing at Exeters County Hall: The collision occurred on the morning of our trip from Milton Keynes to North Devon. I was travelling in my car ahead of my wife. I could see her white Kia Sportage. It slowly drifted out of their lane into the opposite carriageway where it collided head on with a large lorry. Paul who had driving his 14 year old stepson Jack in his car stopped and raced back to his wifes car and saw Jane was trapped in her seat. He tried to find her pulse but there wasnt one. The 44-tonne lorry driver made a statement to the inquest saying the white car pulled out in front of him as if trying to overtake. Driver Adrian Kislingbury was travelling on the A361 at West Buckland, North Devon, tried to steer away from the high speed head on crash. He said the completely stoved in car ended up in the middle of the two lane 60mph carriageway facing the opposite direction it was travelling in. He tried to help Jane and the two children but said the driver and girl in the rear seat were motionless - but he saw the hand of the boy in the front passenger seat move. He was later told by 999 crews that all three had been killed and said: I am devastated by what happened. Motorist James Pugsley witnessed the crash and said the SUV car drifted out of a line of traffic into the path of the artic. He said: It was as if the driver had fallen asleep or been taken ill. Royal Marine Jason Toomey, a combat medic, also witnessed the crash and helped the injured family. He said Jane had no pulse and was unresponsive but he tried to calm her injured son James who was in great pain and distress as he was trapped by the crushed front of the car. His stepfather Paul also tried to help him. The commando said the boys sister was in the footwell in the rear of the car and she was dragged through a smashed window and given CPR. The inquest heard the road was dry, visibilty was good, the weather was overcast and at 8.30am on the morning of July 31, 2017 it was daylight. The triple fatal crash happened just a day after nine year old Keira Ball was killed in a crash on the same stretch of road when her mothers car drifted in to the path of a Ford Ranger 4x4 after she possibly either fell asleep at the wheel or was distracted in the car. Police investigator MPC Philip Rowan-Smith told the coroner the that Jane may have also fallen asleep before the tragic crash. He said other factors had been eliminated but it was possible she dozed at the wheel. He said: For some reason Mrs Baker-Lockett failed to steer and continued ahead on the same course into the opposite lane. The officer said a distraction could not be ruled out but said mobile phones had not been in use. He said she may have been distracted by some event in the cabin which is indeterminable. The car was travelling at between 52-60mph and the DAF lorry at 49mph when the collision happened. The twins were pronounced dead at the North Devon District Hospital later the same morning. Mr Lockett said the family had an early night but set off around 3.20am on the morning of the crash in an effort to beat the traffic. The senior coroner for Exeter and Greater Devon, Philip Spinney, said all three died from multiple injuries which were devastating and unsurviveable. Mr Spinney recorded a conclusion that all three died in a road traffic collision. He told Mr Lockett and his family: It was truly a tragic event and very difficult for you and your family to lose your wife and step children in such circumstances. After the tragedy, the twins father Chris Gaskin said: It is an absolute tragedy - the twins were two fantastic kids who were inseparable. The only positive thing out of this is that they have left this world together.