Attending ex-girlfriend's wedding, arresting the groom's officer on the spot

Chapter 75 Discovery of the impact point
Regarding the analysis of tire marks, Qin Yong didn't have much contact with them, but he would encounter them when investigating cases before.

But as Zhang Yongzhi, the head of the traffic police detachment, he has seen many.

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

At the scene of a general car accident, it is relatively easy to distinguish responsibility.

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

Worst of all, when it gets scratched, it's fine if each person hits [-] boards.

As for calling monitoring, huh, huh.

If there are no major casualties, don't even think about it.

Regardless of your luxury car, this or that, it will be resolved on the spot.

Also, not all crashes happen to happen in monitored places.

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

Especially in traffic accident cases where human life occurs, tire track analysis is an important basis for dividing responsibility.

Whether the vehicle involved in the accident was speeding, whether the brakes were stepped on in time, and other details can be judged through tire marks.

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

But this is like the atmosphere group of a yacht on the sea, there are eight hundred treasures, and there are also one thousand and five treasures.

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

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

This is also the biggest reliance for Zhang Yongzhi to stand up in front of Qin Yong.

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

But when did the criminal investigation come out with such a number one character?
Based on a set of tire marks, it is possible to determine the type of vehicle, the time of use and even the approximate brand range.

Is our traffic police really going to be reduced to Station Avenue?

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, at the scene of the impact, do you want to go and have a look?"

Lu Chuan nodded: "I'll go over and do some data collection after my colleagues in the traffic police are done."

"It's almost done," Zhang Yongzhi shook his head: "The traffic police are done, Lu..."

"Captain Zhang, my name is Lu Chuan."

"Oh, Lu Chuan... I'm old, so I'll call you Xiao Lu."

Although Zhang Yongzhi was at the same level as Qin Yong, his position and police rank were much higher than that of 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 Lu Chuan's conclusion based on the analysis of the tire tracks just now.

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

"Team Zhang, you are welcome."

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

"How is your investigation going?"

Near the point of impact, several traffic police who were investigating the scene of the traffic accident did complete the investigation.

"The length of the tire friction trace is 5.58 meters, the distance from the starting point of braking to the impact point is 4.13 meters, and the length of the braking trace after the impact is 1.45 meters."

This is why Zhang Yongzhi said that the braking trace at the impact point has more comprehensive information about the impact.

In all traffic accidents, as long as the brakes are applied beforehand, but a collision occurs again, 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 have a non-linear change.

Part of the kinetic energy of the vehicle will be transferred to the person or object hit by the impact.

When a human body or object is hit and thrown, causing damage, the speed of the vehicle will also drop sharply.

At this time, there will be a breakpoint in the brake marks. According to the length ratio of the brake marks 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 initial judgment is that the speed at the time of impact was 130 kilometers per hour, and the speed when the vehicle started to brake should be at least [-] kilometers per hour."

"The design speed of Longjiang Road is [-] kilometers per hour, and the vehicle involved in the accident was seriously speeding."

The traffic policeman responsible for the on-site investigation of the traffic accident was Wang Zhiyuan.

He is a top expert in accident spot investigation of the traffic police brigade with rich experience.

Only relying on rough data, we can judge the approximate 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 also wanted to save 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 is the bumper fragment of the vehicle involved in the accident, white."

Wang Zhiyuan pointed to the largest piece of debris marked No. [-] on the roadside: "From the position where Song Kun was hit above the waist, it can be determined that the vehicle involved in 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, which is only available in four-wheel drive vehicles."

"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 Everest."

Wang Zhiyuan's judgment on 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 time is obviously not a good time to 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 are that 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 a step further and directly locked the specific model of the vehicle.

"Old 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 they have dealt with each other a lot when they were involved in this aspect of the case.

"Captain Qin, it's this thing."

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

"As far as this bumper fragment is concerned, I knew it belonged to the Everest at a glance."

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 vehicle.

Wang Zhiyuan is different. He has dealt with traffic accidents for more than [-] years, and he knows what kind of car it is just by looking at the broken bumper.

The next job is easy.

Lu Chuan began to collect tire track data near the impact point.

"How about it?"

Although Liu Guodong is not very familiar with the identification and analysis of tire marks, some basic surveys are naturally no problem.

Lu Chuan knew what Liu Guodong was asking: "It's the same pattern as the tire of the car at the corner over there, and the degree of wear is the same."

After picking up a little residue, Lu Chuan smelled it and crushed it lightly: "It feels the same to the touch, and the traces are within three hours. It is definitely the same car!"

(End of this chapter)