Chapter 75 Discovery of the Impact Point
Qin Yong has not had much contact with the analysis of tire marks, but he has encountered it before when investigating cases.
As the leader of the traffic police detachment, Zhang Yongzhi has seen a lot.
Tire mark analysis has always been the strong point of the traffic police detachment.
In general car accident scenes, it is easier to distinguish responsibilities.
An experienced traffic policeman can tell who is the primary responsible person and who is the secondary responsible person at a glance.
The worst thing is, if there is a scratch, just hit fifty big boards each.
As for calling the monitoring, haha.
There are no major casualties, so don’t even think about it.
It doesn’t matter what luxury car you have, this or that, it will be solved on the spot.
Moreover, not all car accidents happen to occur in monitored areas.
Therefore, tire mark analysis has become an important means to determine traffic liability.
Especially in traffic accident cases involving human lives, tire mark analysis is an important basis for assigning liability.
Whether the vehicle involved in the accident was speeding, whether it braked in time and other details can be judged through tire marks.
From the point of view of the police despising the chain, traffic police are mostly at the bottom of the chain.
But this is just like the sea yacht atmosphere group. There are eight hundred treasures and one thousand and fifty treasures.
No matter what level it is, it has its own market and its own advantages.
The traffic police are definitely the best in the entire public security system when it comes to tire mark analysis.
This is also the biggest reason why Zhang Yongzhi can stand up in front of Qin Yong.
Over the years, the Criminal Investigation Detachment has asked the Traffic Police Detachment to help with tire mark analysis not once or twice.
However, when did criminal investigation reveal such a number one figure?
With just a set of tire marks, it is possible to determine the type of vehicle, its age of use and even its approximate brand range.
Are our traffic police really going to be reduced to standing on the street?
Compared with Zhang Yongzhi's shock, Qin Yong was more concerned about the case itself and the accuracy of Lu Chuan's analysis.
"Lu Chuan, over there at the impact point, would you like to go and have a look?"
Lu Chuan nodded: "When the traffic police colleagues finish their work, I will go over and do some data collection."
"Almost," Zhang Yongzhi shook his head: "The traffic police have finished it, Lu..."< br>
“Captain Zhang, my name is Lu Chuan.”
“Oh, Lu Chuan...I’m older, let’s call you Xiao Lu.”
Although Zhang Yongzhi and Qin Yong was at the same level, his position and police rank were much higher than Lu Chuan, but Lu Chuan was not a traffic policeman, he had no jurisdiction, and he spoke very politely.
What's more, Zhang Yongzhi was impressed by the conclusion that Lu Chuan had just analyzed based on the tire marks.
When did the criminal investigation detachment have such a young and powerful person?
"Captain Zhang, you are so polite."
"I will take you there. The tire marks on the other side of the impact point are clearer and the impact information is more comprehensive."
"How's your survey going?"
Near the point of impact, several traffic police officers who were investigating the scene of the traffic accident had indeed completed their investigation.
“The length of the tire friction mark is 5.58 meters, the distance from the braking starting point to the impact point is 4.13 meters, and the length of the braking mark after the impact is 1.45 meters.”
This is why Zhang Yongzhi said, Skid marks at the point of impact provide more comprehensive information about the cause of the impact.
In all traffic accidents, as long as the brakes are applied beforehand and a collision occurs, it means that the braking distance is too short and the vehicle did not stop before the collision.
Generally speaking, the braking process is linear and the entire braking trace is continuous.
But at the moment of impact, due to the obstruction of objects or human bodies, the speed of the vehicle will change non-linearly.
Part of the kinetic energy of the vehicle will be transferred to the person or object being hit through the impact.
If a human body or object is hit and thrown away, causing damage, the speed of the vehicle will also drop sharply. At this time, a breakpoint will appear in the brake mark. Based on the length ratio of the brake mark before and after the breakpoint, the speed of the vehicle at the time of impact and when the brakes are applied can be calculated.
“The preliminary judgment is that the speed at the time of impact was 90 kilometers per hour, and the speed of the vehicle when it started braking should be at least 130 kilometers per hour.”
"The design speed of Longjiang Road is 80 kilometers per hour, and the vehicle involved in the accident was seriously speeding at the time."
The traffic policeman responsible for the on-site investigation of the traffic accident was called Wang Zhiyuan.
He is a top expert in accident investigation in the traffic police brigade and has very rich experience.
Only by relying on rough data, we can determine the general situation at that time.
“What are the characteristics of a vehicle?”
Zhang Yongzhi had just been shown off by Lu Chuan, and this time he wanted to compete for face in front of Qin Yong.
“At the moment of impact, the front and rear breakpoints of the four-wheel friction marks were 2850 mm, which is the wheelbase of the vehicle involved in the accident.”
“The debris scattered on the road are fragments of the bumper of the vehicle involved in the accident. White. "
Wang Zhiyuan pointed to the largest piece of debris marked No. 1 on the roadside: "From the position where Song Kun was hit above the waist, it can be determined that the vehicle involved was an off-road vehicle."
" And here," Wang Zhiyuan squatted down and pointed to the end of the tire scratches: "After the impact, the vehicle left the scene, and there were signs of driving on all four wheels, which is unique to four-wheel drive vehicles."
"Based on these traces, it can be determined that the vehicle responsible for the accident is a white four-wheel drive off-road vehicle, and the specific model should be a Ford Everest."
Wang Zhiyuan's judgment about the vehicle information was the same as Lu Chuan's.
White four-wheel drive off-road vehicle.
However, Wang Zhiyuan’s judgment added a specific model!
This surprised Lu Chuan.
However, this is obviously not a good time to step forward and ask.
At least it was not the time for Lu Chuan to ask.
Qin Yong has also been listening to the report. Wang Zhiyuan and Lu Chuan came to the conclusion that although the process was different, the result was a white four-wheel drive off-road vehicle with a wheelbase of 2850 mm.
Wang Zhiyuan went one step further and directly locked the specific model of the vehicle.
“Lao Wang, how can you determine the specific model of the vehicle?”
Qin Yong and Wang Zhiyuan have known each other for a long time, and they often interacted with each other when it came to cases in this area.
“Team Qin, this is it.”
Wang Zhiyuan once again pointed to a large piece of white bumper fragment on the side of the road: “Each model of vehicle has a different appearance. The bumper The specifications are also different."
"Just this bumper fragment, I knew it was from the Road Shaker."
Qin Yong nodded.
Lu Chuan nodded.
This is the benefit of experience.
Although Lu Chuan judged a lot of basic information about the vehicle based on the tire marks.
But because I am not familiar with the vehicle model, I can only lock the range and cannot confirm the specific car.
Wang Zhiyuan is different. He has been involved in traffic accidents for more than 20 years. He can tell what kind of car this is just by looking at the fragments of the bumper.
The next work is simple.
Lu Chuan began to collect data on tire marks near the impact point.
“How is it?”
Although Liu Guodong is not familiar with the identification and analysis of tire marks, some basic spot surveys are naturally no problem.
Lu Chuan knew what Liu Guodong was asking: "It has the same tire pattern and the same degree of wear as the vehicle at the corner over there."
Twisting up some residue, Lu Chuan smelled it and crushed it gently: "The touch is the same, and the traces are within three hours, it is definitely the same car!"
(End of this chapter)