police warning tape

Shocking footage has emerged from the United States, which shows a man hanging onto the back of a car as it drives along the motorway at speeds in excess of 50mph.

North Carolina resident Brenda Cruz was driving along Interstate 77 with her family when she alerted to the man by her children.

"All of a sudden the kids say, 'There's someone on top of the car on the trunk,' and I'm like 'What?'" she told US news outlet WSOC.

"I said, 'Let me get my phone and started recording.'"

The man is initially seen just sitting on the boot of the car, but then he manoeuvres his body in such a way as to allow him to strike the rear window.

Eyewitnesses report the man had a sharp object in his hand, enabling him to shatter the glass and clamber onto the rear seat.

Concerns are now being raised about the safety of the car's occupants – a woman and young child – though police believe the trio know each other and that the incident was the result of a domestic dispute. Despite receiving numerous calls, officers were unable to locate the car.

Click play below to watch a US TV news report on the incident.