Qin Yong has not had much contact with the analysis of tire marks, but he has encountered it before when investigating cases.
But 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.
At a general car accident scene, it is relatively easy to distinguish responsibilities.
An experienced traffic policeman can tell who is primarily responsible and who is secondary responsible at a glance.
The worst thing is that if the scratches start, one person can hit fifty big boards each.
As for calling the monitoring, haha.
If there are no serious casualties, you'd better not 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.
Details such as whether the vehicle involved in the accident was speeding, whether it braked in time, etc. can all be determined through tire marks.
From the perspective of the police type and the chain type, 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 analyzing tire tracks.
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?
Just from a set of tire marks, it is possible to determine the type of vehicle, the age of use and even the 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 take a look?"
Lu Chuan nodded: "When the traffic police colleagues finish their work, I will go over and do some data collection."
"It's almost done," Zhang Yongzhi shook his head: "The traffic police have finished it, Lu..."
"Captain Zhang, my name is Lu Chuan."
"Oh, Lu Chuan... I'm older, so I'll call you Xiao Lu."
Although Zhang Yongzhi is at the same level as Qin Yong, and his position and police rank are much higher than that of Lu Chuan, Lu Chuan is not a traffic policeman. He has no jurisdiction and speaks 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're welcome."
"I'll take you there. The tire marks on the 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 tire friction mark length is 5.58 meters, the distance from the braking starting point to the impact point is 4.13 meters, and the braking mark length after the impact is 1.45 meters."
This is why Zhang Yongzhi said that the brake marks at the impact point provide more comprehensive information about the impact.
In all traffic accidents, as long as the vehicle brakes 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 vehicle's kinetic energy will be transferred to the person or object being hit through the impact.
If the 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.
"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 this traffic accident was named Wang Zhiyuan.
He is the top expert in accident investigation in the traffic police brigade and has very rich experience.
Just relying on rough data, we can judge the general situation at that time.
“What are the characteristics of the 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 fragments scattered on the road are white fragments of the bumper of the vehicle involved in the accident."
Wang Zhiyuan pointed to the largest fragment marked No. 1 on the roadside: "From the fact that Song Kun was hit above the waist, it can be determined that the vehicle responsible for the accident 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 driving marks on all four wheels. This is only found on 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 wasn't the time for Lu Chuan to ask.
Qin Yong has also been listening to the report. The conclusions drawn by Wang Zhiyuan and Lu Chuan, although the process is different, the result is 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.
"Captain Qin, this is it."
Wang Zhiyuan once again pointed to a large white bumper fragment on the side of the road: "Each model of vehicle has a different appearance and different bumper specifications."
"Just this piece of bumper, I knew it was from a Roadshaker as soon as I saw it."
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.
However, 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 it 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 about 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 wear level as the vehicle on the corner over there."
Twisting up a bit of the 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!"
