Dr Syd Hassan from Maidstone was stuck in traffic on the A5 near Shrewsbury when a 2018 Morgan Plus 4 smashed into the back of his Audi SUV.
The video shows the classic-style car crumple into his car, before it spins off the road.
WATCH: Footage of the impact of the crash
Dr Syd Hassan's vehicle barely moved, despite the impact, which caused the bonnet to fly off the Morgan.
But he and his partner ended up being taken to hospital with neck and soft tissue injuries.
The 31-year-old, who lives in Maidstone, said: "We were off on a four day holiday to Snowdonia and were coming back home in our Model year 2019 Audi SUV, on A5 near Shrewsbury.
"We slowed down with other cars at a busy roundabout when this gentleman came out of nowhere at 70mph and rammed his car into us from behind.
"My first reaction was that of shock and jolt, but being an emergency doctor within seconds I was running to that gentleman so see if he was ok.
"My partner also started walking behind me, but she felt dizzy and slumped down on side of the road for a few seconds to recover.
"Nobody stopped for good 10 to 15 minutes and I checked the gentleman.
"I was helping him out of his car, on his request, as his doors were jammed, when a lovely couple stopped.
"She was an off-duty nurse in acute medicine and they helped me to get him out of car.
"My partner called police and ambulance, who both were on scene in 20 to 25 minutes."
The accident happened at around midday on Friday and the Morgan driver was also taken to hospital.