A distraught father watched with his 14-year-old son in his rear view mirror as his wife's car collided with an M&S lorry yesterday, killing her and her two twins.
The 43-year-old mother was driving towards Barnstaple in Devon with her 12-year-old son and daughter when the children’s stepfather saw them crash.
The family from the Milton Keynes area were believed to have been travelling to a holiday in two cars when the collision happened on the A361 near Aller Cross.
The woman was driving towards Barnstaple in Devon when her car collided with a lorry
The shocking crash on the A361 witnessed by the woman's husband from a vehicle in front
Police confirmed today that the mother died at the scene and her 12-year-old daughter was pronounced dead on arrival at North Devon District Hospital.
Her 12-year-old son was taken to hospital in an air ambulance but died shortly after his arrival following the collision in the family Kia Sportage at about 8.25am.
The road was closed for nine hours while officers from Exeter Serious Collision Investigation Unit examined the scene.
Emergency services were called to the scene following what some police officers described as one of the most shocking crashes they had seen.
The collision involving a car and lorry happened on the A361 (pictured yesterday) near Aller Cross as the woman was driving towards Barnstaple in Devon at about 8.25am
Three ambulances, five rapid response vehicles and the air ambulance attended the scene
Inspector Richard McLellan from Devon and Cornwall Police said the father was in a different car on the same road.
He said: 'It would seem that a car travelling towards Barnstaple, for unknown reasons at the moment, has crossed the centre white line and hit an oncoming truck.
'Unfortunately the family were travelling in two separate cars but travelling together along this road, so dad was there at the scene as well.'
It comes after a similar incident on the same road on Sunday at 11.30am saw another mother and her two young children in a crash which left them all seriously hurt.
Highway Maintenance crews were at the scene of the tragedy this evening, clearing the road
North Devon Conservative MP Peter Heaton-Jones declared the A361 - which is known locally as the North Devon link road - as 'unsafe' after the two crashes.
He told BBC Devon that motorists on the road are generally 'taking too many risks because there are short overtaking lanes that suddenly merge at not much notice'.
Mr Heaton-Jones, 53, said that he was working together with the area's local councils to 'get the money we need to get the improvements to this link road'.
He tweeted: 'Very sad to hear three people - a mother and two children - died in #NDevon Link Road crash. Thoughts with families and emergency services.'
The road remains closed as police carry out an investigation into the devastating crash
Mr McLellan said: 'It seems at the moment we had two cars travelling towards Barnstaple - a family on holiday in the