This is the horrific moment two cars and a van were sent flying across the road - after the cars both tried to overtake the van at the same time.
The dramatic dashcam footage clip has been released by the driver in a bid to hope people take notice of the potential dangers of overtaking.
It shows how all three vehicles are wiped off the road - with one flipping over onto its roof after careering up a bank and a van plunging down an embankment on the other side of the road.
Motorist Mike Ashcroft recorded the footage when he was driving behind the vehicles on the A470 near Brecon yesterday morning.
He said: "The footage is just shocking.
"I think it takes scenes like this for people to realise how dangerous it can be on that road. It may make people take notice - it's important to show people."
Fortunately, no serious injuries were reported with the ambulance service describing the casualties as "walking wounded" despite two people being trapped.
Mr Ashcroft, 47, said he wanted to raise awareness about the dangers of roads like the A470.
Two women were in the car in front of him but were trapped upside down in their seats after the car ended on its roof, Wales Online reports .
He added: "Luckily they had their seat belts on but they were still stuck in the seats. They said they were OK but they looked in shock."
Other drivers also stopped to help and emergency services were on the scene very quickly.
A spokesman for the Welsh Ambulance Service said: "We received a call at 9.31am to a report of a three-vehicle accident with two persons trapped.
"Two ambulances and a rapid response vehicle attended. Persons trapped were freed quite quickly and the crew reported there were four walking wounded patients at the scene and they were taken to Prince Charles Hospital."