On the 25th, Guangdong Qingyuan** reported a tragic car accident on the evening of December 21: an ideal L7 collided with a heavy-duty semi-trailer tractor, resulting in two deaths and one injury.
As early as the 22nd and 24th, Li Auto's official Weibo successively posted articles, revealing more information about the car accident and also announcing the accident-related **.
According to **, 3 seconds before the collision, the driver took braking measures at a speed of 178 km h, and the vehicle rear-ended a large truck that was squirming across the dual lane in front of it at a speed of 96 km h.
Many netizens wonder why such a tragic car accident happened to smart electric vehicles, which makes people sad and regretful
If you analyze it carefully, it will not be difficult to understand the reasons and what lessons to learn.
Without turning on the assisted driving function, the "intelligent driving" software and hardware of electric vehicles will not be able to help the vehicle driving process.
If this function is turned on, maybe a bunch of radars and cameras can detect the semi-trailer in front of the driver before the driver, especially when the light at night seriously affects the human eyeMaybe the "speed control by road limit" function will prevent the car from going up to 178 speeds ...... mph
According to the relevant information, three seconds before the collision, the vehicle reached a speed of 178 km h, and the driver applied braking measures, and finally rear-ended the truck at a speed of 96 km h......
From the perspective of physics, we can analyze and calculate, and roughly calculate some motion data, for example, how far away does the driver find the semi-trailer in front of him and press the brakes?
Suppose the driver immediately applies the brakes when he notices the semi-trailer in front of him, and the braking time is "3 seconds before the collision".
It is assumed that the driver's reaction speed is the general reaction time (0.).4~1.0s), take 1 second;
Assuming that the response time of the L7 braking system ranks in the first echelon, the reaction time of the braking system (the time required for the pedal to be pressed, the pedal to overcome the free stroke, the brake clearance, and the reaction time of the general hydraulic braking system is 0.).015s-0.03s).015 seconds, brake action time (general hydraulic braking system action time TB is 0.)15 sec - 03 seconds) to take 015 seconds.
It can be calculated that the braking distance of the car is about 158 meters, and the braking acceleration is about -759m s2, approx. 077 gravitational accelerations.
Article 80 of the Regulations for the Implementation of the Road Traffic Safety Law of the People's Republic of China stipulates that when a motor vehicle is driving on a highway at a speed of more than 100 kilometers per hour, it shall keep a distance of more than 100 meters from the vehicle in front of it in the same lane. For night driving on an unenclosed highway at a speed of 178 per hour, the braking distance of 158 meters is obviously too short!
Even if there is an urgent matter, it is too dangerous to drive too high, too close to each other, and brake too late, after all, safety comes first.
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