A helmet dropped from someone’s motorbike on a highway could lead to a serious crash between three cars. That’s what happened in Ho Chi Minh City on Saturday.

At around 2:30 pm, a four-seater car was traveling downward the Binh Loi Bridge on Pham Van Dong Avenue, when a helmet stuck into its bottom.

The driver was then preparing to stop by the roadside to fix the incident, when a 16-seater bus crashed into its rear. Even worse, a five-seater car that was traveling just behind the bus could not stop in time, leading to the second crash into both vehicles.

The multi-car crash destroyed the rear section of the four-seater and severely injured three people on that car. They were rushed to hospital immediately.

The 16-seater bus had its head damaged, whereas the five-seater was only slightly damaged.

“It was raining then and my vision was not clear enough,” the bus driver said.

“I did see the four-seater car’s emergency light was on and he was slowing down, but I just failed to swerve in time.”

The driver said he felt fortunate that he and his assistant driver survived the rear-end collision.

It took Thu Duc District police two hours to clear traffic following the accident.