Chapter 7, Brake Marks

Zhou Ning led them over, casting an apologetic glance at Zhao Xinli, only to find that the young man had no idea what embarrassment meant, following along with great interest and still wearing a cheerful smile on his face

Zhou Ning let out a sound of realization, thinking of the 48-hour deadline, feeling somewhat anxious in her heart

Xu Dayuan nodded slightly and glanced at the records in Zhou Ning's hand

Xu Dayuan waved his hand

Among these data, the one that matches best is the 2010 Volkswagen CC 2.0 TSI Premium, which is completely consistent with the data you provided

The three values obtained are: tire width 235 millimeters, track width 1586 millimeters, and wheelbase 2841 millimeters

Zhao Xinli stood to the side, watching Zhou Ning write and draw. Suddenly faced with such a question, he felt somewhat bewildered, but he quickly nodded in response

Biaozi, I will go check the identity of the deceased. You are in charge of leading the team to search for evidence at the scene, and you haven't found anything at all!

Zhou Ning suddenly recalled the forensic scene study, automatically searching for a passage regarding the investigation of a traffic accident scene. One crucial part of this passage was about the brake marks.

While searching for information on brake marks, I came across a subsequent inspection report

Zhou Ning's confusion did not hinder the release of tasks on the display screen, as green characters continuously appeared.

Please note that by selecting to view the task reward content, it is assumed that you accept the task

Upon hearing this, Zhou Ning quickly handed the clamp in his hand to Zhao Xinli

Zhou Ning nodded vigorously, unable to suppress the excitement on his face

"Forensic expert Xiao Zhou, please take me to see the brake marks you discovered as soon as possible"

I will take a look. Previously, the personnel from the traffic police came to determine that this is the mark of a sedan, and we did not allow them to go up.

This provides guiding value for the extraction of rubber evidence comparison samples, offering an objective basis for the trial and litigation of the case

Temporary task

Identify the vehicle and the perpetrator responsible for the fatal injury. The task must be completed within 48 hours. The reward for completion is a Level 3 forensic field study. If the task fails, the initial reward will be downgraded by one level.

You look down on people, don't you! From F1 to the three-wheeler used at home, I have studied them all. I could take apart the car my dad needed to repair when I was just twelve. As long as it's a car that's on the market and available domestically, I basically understand it. In our criminal police team, if I say I'm second, no one dares to claim the first position. So, what do you want to do?

He wants to curse, this is simply unreasonable, how can there be such a rule, why didn't you mention it earlier

Thinking of this, the report reappeared in Zhou Ning's mind. This time, he did not glance over it but instead examined it carefully

Prompt

Do not let them make up for it, quickly check what this data is, and whether the vehicle model can be identified

Zhou Ning

At that moment, a sudden screech of brakes was heard not far away, and a figure quickly got out of the car, crossed the security line, and ran to their side. The person was Xu Dayuan, whose smile could no longer be suppressed.

In traffic accident cases, the scraping and colliding of vehicle tires with other objects, as well as the sliding friction between the brakes and the ground, can result in the transfer of rubber particles to the contacted objects or leave traces on the ground in the form of skid marks. Examining these rubber particles can provide evidence for reconstructing the truth of the facts and identifying the vehicle responsible for the accident

Based on the rectal temperature, the estimated time of death for the deceased is 2:23 AM. In the report provided, Forensic Expert Liu instructed me to write that the time was between 2:00 and 3:00 AM. Given the high speed of travel, I noticed that there were also brake marks from another vehicle parallel to this one. I suspect whether someone was engaged in illegal street racing

Zhao Xinli dodged to the side, and his fingers seemed to be enlarging the image, followed by a gasp of surprise

The report states that the rubber from the tire marks on the ground should be extracted and then compared with the rubber from the suspect's vehicle tires in order to identify the suspect vehicle

"I can't believe it, is it true? Is there someone in our county driving such an expensive car?"

Please inform Xu Da to find the vehicle model, and the search range can be reduced as well

Zhou Ning exhaled, suppressing his excitement, and used a evidence bag to pack the extracted rubber particles, then stood up.

The more he looked, the more Zhou Ning nodded, crossing over the English section, beneath the title of the journal

I am not certain, but these three sets of data are fine. Zhao Xinli is very familiar with cars; he found the promotional image of the 2010 Volkswagen CC 2.0 TSI and confirmed that it is indeed the same as what was discovered on site.

This article explores the conditions for gas chromatography-mass spectrometry analysis of rubber pyrolysis and examines rubber evidence from a traffic accident case using the established method and scanning electron microscopy-energy dispersive X-ray spectroscopy.

Zhao Xinli glanced over, became interested, blinked his small eyes, and quickly opened his phone to search. Zhou Ning felt a bit uncertain upon seeing this, as searching on Baidu might not yield accurate results.

PS:

The boss said he will arrive shortly

Return to the area with the blood-stained brake marks, kneel on one knee, and use a small shovel to scoop up some of the rubber from the road surface

Do you understand cars? If not, find someone who does to come over

After measuring the data, it was found that it is completely different from the previous vehicle, with a tire width of 357 millimeters, a track width of 1590 millimeters, and a wheelbase of 2780 millimeters

... ...

Zhou Ning pondered for a moment and walked to the edge of the bloodstain

This discovery caused Zhou Ning's heart to race with excitement

What can this thing indicate with just one brake mark

Leader, please do not rush. I just noticed that the traces here are somewhat similar, but compared to the brake marks near the bloodstains, this area is much fainter, and the braking distance is also longer

Sure, Dr. Zhou, you keep surprising me today. Are you certain about the model of the vehicle

According to the system prompt, what I currently possess is Level 2 forensic scene study, while Level 3 encompasses more detailed and advanced knowledge

A thought suddenly appeared in Zhou Ning's mind: if there were two cars, could it be ... ...

This is an article from six years later, so the forensic scene studies that one has obtained are not also textbooks from several years later

The deceased was stabbed while standing here at that time, and did not move afterwards, subsequently being thrown away. Based on the body being thrown a distance of 112 meters, and considering the weight of the vehicle, even if the car braked for 4.5 meters, the speed would still exceed 100 miles per hour, indicating that the speed prior to braking would have been even higher

Zhao Xinli was already eager to try on one side, glancing at the three pieces of data, quickly browsing on his phone. After flipping through for a long time without any further developments, Xu Dayuan had already lifted his leg.

Automobile tires predominantly utilize natural rubber (NR), butadiene rubber (BR), and styrene-butadiene rubber (SBR) in single or blended formulations, while also incorporating vulcanizing agents, accelerators, anti-aging agents, fillers, and other organic or inorganic additives. The type of rubber can be accurately determined based on characteristic pyrolysis products, and when combined with the SEM-EDX method, a comprehensive analysis of the organic components and inorganic elements in the rubber can be conducted. In recent years, this has become an important means of rubber inspection and identification.

I do not know if you have studied these traces before, I measured and obtained these three values, can you tell what kind of car it is

Zhou Ning shook his head honestly

By comparing the similarities and differences in rubber materials and inorganic elements between the evidence and samples, as well as among different samples, the identification and comparison of the evidence and samples can be achieved. It has been found that the tread rubber and sidewall rubber compositions of different tires vary, and even the compositions of the tread rubber and sidewall rubber of the same tire exhibit differences

He shook his head, perhaps thinking too much.

Zhou Ning was taken aback and could not speak directly.

Wait, the brake marks...

Suddenly, the other text on the screen disappeared, leaving only a countdown of 48 hours, and a sense of urgency instantly emerged

Zhou Ning stood up and walked north for more than ten meters, discovering that there was also a conical tower sign here, with a slightly lighter brake mark, although the end did not draw an 8, it was still two opposing C shapes

Zhao Xinli and Xu Dayuan both looked at Zhou Ning. After this statement, the two fell silent, and Zhou Ning felt a bit nervous for a moment. Could it be that his speculation was far-fetched?

It has been confirmed, it is the new Volkswagen CC 2010 model. Does forensic expert Xiao Zhou have any other findings?

Seeing these several values, Zhou Ning looked up at Zhao Xinli

Holding a ruler, Zhou Ning measured the width of the single-sided brake marks more carefully this time, as well as the distance between the two brake marks, and estimated the wheelbase based on the figure-eight marks

What happened, I didn't pay attention to what you said

Speaking, Xu Dayuan dialed a phone number and inquired about the data from the other party, who provided an accurate response. Only then did he let out a sigh of relief

For a moment, Zhao Xinli held the phone up in front of Zhou Ning, displaying an image filled with various data, seemingly content released by the authorities

"Dr. Zhou, what are you thinking? Did you not hear me when I was talking to you?"

At that moment, Xu Dayuan kicked Zhao Xinli, his face filled with anger

There is a volume (issue) 2016 (041) 005, Zhou Ning was stunned

1. Pyrolysis Gas Chromatography-Mass Spectrometry

Professionals are indeed professionals. Our team found traces of braking, but the information obtained is limited. We only know that it was a sedan and that it was speeding. We did not expect to be able to compare these details, so I will give you credit for this achievement

A weight settled on his shoulder as Zhao Xinli's large face leaned in closer

Zhao Xinli smiled broadly, his teeth visible but not his eyes. It was a phone call to share good news that he was asked to make, a testament to Zhou Ning's trust in him, prompting him to quickly rise and make the call