Regarding the analysis of tire tracks, Qin Yong has not been in contact with much, but he has encountered it when investigating cases before.

But Zhang Yongzhi, who is the head of the traffic police detachment, has seen a lot.

Tire trace analysis has always been the strong business of the traffic police detachment.

In the case of a general car accident, it is easier to distinguish responsibility.

Who is the primary responsibility and who is the secondary responsibility, experienced traffic police can know at a glance.

The worst is the worst, scratching up, and one person can play fifty boards each.

As for calling up the surveillance, hehe.

There are no major casualties, you still don't think about it.

It doesn't matter what luxury car you have, all of them will be solved on the spot.

Moreover, not all car accidents happen to happen in a place where there is surveillance.

Therefore, tire track analysis has become an important means of judging traffic responsibility.

Especially in traffic accident cases where there is a human life, tire trace analysis is an important basis for assigning responsibility.

Details such as whether the vehicle involved in the accident was speeding, whether it stepped on the brakes in time and other details can be judged by tire tracks.

From the police despise the chain, the traffic police are mostly at the bottom of the chain.

But it's like the yacht atmosphere group on the sea, there are 800 treasures, and there are 1,050 treasures.

No matter what level, it has its own market and its own advantages.

The traffic police are definitely the best in the entire public security system in terms of tire trace analysis.

This is also Zhang Yongzhi's biggest reliance on being able to hold his chest up in front of Qin Yong.

Over the years, the criminal investigation detachment has asked the traffic police detachment to help with tire trace analysis, not once or twice.

However, when did the criminal investigator come out with such a number one person?

Just by a set of tire tracks, you can 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 is more concerned about the case itself and the accuracy of Lu Chuan's analysis.

"Lu Chuan, over there at the impact site, do you want to go over and have a look?"

Lu Chuan nodded: "When the colleagues of the traffic police are busy, I will go over to do some data collection." ”

"Almost," Zhang Yongzhi shook his head: "The traffic police have already finished it, Lu ......"

"Team Zhang, my name is Lu Chuan."

"Oh, Lu Chuan...... I'm old, let's call you Xiao Lu. ”

Although Zhang Yongzhi is at the same level as Qin Yong, his position and police rank are much higher than Lu Chuan, but Lu Chuan is not a traffic policeman, he has no jurisdiction, and he speaks very politely.

What's more, the conclusion that Lu Chuan came to based on the analysis of tire tracks just now also impressed Zhang Yongzhi.

When did the criminal investigation detachment come out with such a young and powerful person?

"Team Zhang, you're polite."

"I'll take you there, the tire tracks at the impact point are clearer, and the impact information is more comprehensive."

"How's your survey going?"

Near the impact site, several traffic police officers who investigated the scene of the traffic accident did also complete the investigation.

"The length of the tire friction mark is 5.58 meters, the distance from the start of the brake to the impact point is 4.13 meters, and the length of the brake mark after the impact is 1.45 meters."

This is why Zhang Yongzhi said that the brake marks at the point of impact have more comprehensive information about the impact.

In all traffic accidents, as long as the brakes are applied beforehand, but there is another impact, it means that the braking distance is too short and the vehicle does not stop before the impact.

In general, the process of braking is linear, and the entire brake trace is continuous.

However, at the moment of impact, there will be a non-linear change in the speed of the vehicle due to the obstruction of objects or human bodies.

A portion of the vehicle's kinetic energy is transferred to the person or object being hit by the impact.

If a person or object is thrown into the air, causing damage, the speed of the vehicle will also drop sharply.

At this time, there will be a breakpoint in the brake trace, and according to the proportion of the length of the brake mark before and after the breakpoint, the speed of the vehicle at the time of impact and when the brake is applied can be calculated.

"The preliminary judgment is that the speed at the time of impact is 90 kilometers per hour, and the speed when the vehicle starts braking should be at least 130 kilometers per hour."

"The design speed of Longjiang Road was 80 kilometers per hour, and the vehicle involved in the accident was in a serious state of speeding."

The traffic policeman in charge of the scene investigation of the traffic accident is called Wang Zhiyuan.

He is a top expert in the investigation of accidents in the traffic police brigade and has a lot of experience.

Just based on rough data, you can judge the general situation at that time.

"What are the characteristics of the vehicle?"

Zhang Yongzhi was just shown off by Lu Chuan, and this time he also wanted to fight for face in front of Qin Yong.

"At the moment of impact, the front and rear breakpoints of the four-wheel friction marks were 2,850 mm, which is the wheelbase of the vehicle that caused the accident."

"The debris scattered on the road is the bumper fragments of the vehicle that caused the accident, white."

Wang Zhiyuan pointed to the largest piece of debris marked No. 1 on the side of the road: "From the position above the waist where Song Kun was hit, it can be determined that the vehicle involved in the accident is an off-road vehicle." ”

"And here," Wang Zhiyuan squatted down and pointed to the end of the tire scratches: "After the collision, the vehicle left the scene, and all four wheels had driving traces, which is only available in four-wheel drives." ”

"Based on these traces, it can be determined that the vehicle involved in the accident is a white four-wheel drive off-road vehicle, and the specific model should be a Ford Road Shaker."

Wang Zhiyuan's judgment on vehicle information is the same as what Lu Chuan did.

White 4x4 buggy.

However, Wang Zhiyuan's judgment has one more specific model!

This made Lu Chuan a little surprised.

However, this is obviously not a good time to come forward and ask.

At least it wasn't the time for Lu Chuan to ask.

Qin Yong has also been listening to the report, Wang Zhiyuan and Lu Chuan's conclusions, although the process is not the same, but 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 do you determine the specific model of the vehicle?"

Qin Yong and Wang Zhiyuan have known each other for a long time, and when they were involved in this aspect of the case before, they had dealt with each other a lot.

"Team Qin, it's this thing."

Wang Zhiyuan once again pointed to a large piece of white bumper fragments on the side of the road: "Each model of vehicle has a different appearance, and the specifications of the bumper are also different. ”

"Just this bumper fragment, I knew it was a roadshaker when I saw it."

Qin Yong nodded.

Lu Chuan nodded.

That's the benefit of being experienced.

Although Lu Chuan judged a lot of basic information of the vehicle based on the tire tracks.

However, because I am not familiar with the vehicle model, I can only lock the range, and I cannot confirm what the specific car is.

Wang Zhiyuan is different, he has been dealing with traffic accidents for more than 20 years, and he knows what kind of car this is by looking at the bumper fragments.

The rest is simple.

Lu Chuan began to collect data on tire tracks near the point of impact.

"How?"

Although Liu Guodong is not very familiar with the identification and analysis of tire tracks, there is no problem with some basic field surveys.

Lu Chuan knew what Liu Guodong was asking: "The tire pattern is the same as that of the vehicle on the corner over there, and the degree of wear is the same." ”

Twisting up a little residue, Lu Chuan sniffed it and gently crushed it: "The touch is the same, the traces are within three hours, it is sure to be the same car!" ”