According to the information sent back by the black box.
It was a female passenger (48 years old, from Wanzhou District) who had an argument with the bus driver Ran who was driving at high speed on the bridge because she missed the place to get off.
And in the black box video sent back, the two obviously had a physical collision, which caused the driver to suddenly turn the steering wheel at a large angle when he turned to stop the female passenger's fist (the speed reached 50 kilometers per hour).
Everyone should also know that if you are driving at high speed, a slight turn of the steering wheel will cause great risks.
Therefore, this emergency steering wheel caused the vehicle to lose control, collided with a red car with a speed of 58 kilometers per hour, and finally rushed down the guardrail and fell into the river.
However, after investigating Ran's daily routine in recent days, no abnormality was found, which basically ruled out the influence of the driver's own mental factors.
In a word, it was the fight between the driver and the passengers that caused the bus to fall into the river.