This shocking footage shows a father carelessly going through traffic and failing to notice when his little son had fallen off the back.

The incident in which the driver behind had to slam on his brakes and the boy then ran after the vanishing bike was captured on a driver's dash cam as he was travelling behind them on the street in Yunnan Province, in south-western China.

In the video, the parent can be seen riding along the left-most lane with the toddler sitting behind.

Suddenly, as he approached a turn, the child lost balance and toppled onto the tarmac.

Astonishingly, the dad did not seem to notice and kept on moving while the little boy helplessly yelled and chased after him.

Luckily, the driver who travelled behind saw the boy fall and hit the brakes before he accidentally ran over him, then followed after the motorcyclist father to let him know he lost his son in traffic.

Locals criticised the parent over his seemingly careless behaviour.