Regarding tire trace analysis, Qin Yong hasn't dealt with it much, but he has encountered it in past cases.

However, for Zhang Yongzhi, the captain of the traffic police team, he's seen it many times.

Tire trace analysis has always been a strong suit for the traffic police team.

In general traffic accident scenes, it's relatively easy to distinguish responsibility.

Who is primarily responsible, who is secondarily responsible, experienced traffic officers can tell with just a glance.

At worst, if both parties are at fault, both might share equal punishment.

As for retrieving surveillance footage, well...

If there are no major casualties, don't count on it.

No matter how luxurious the car is, it's usually resolved on the spot.

Moreover, not all accidents occur at places with cameras.

Therefore, tire trace analysis becomes an important means to determine traffic responsibility.

Especially in traffic accidents involving fatalities, tire trace analysis is a crucial basis for assigning responsibility.

Details such as whether the vehicle was speeding or if it braked in time can be determined from tire traces.

In the hierarchy of police forces, traffic officers are often at the bottom.

But it's like with the yacht ambience groups at sea, with both the inexpensive and the expensive offerings.

No matter the level, they all have their market and advantages.

In tire trace analysis, traffic officers are definitely the best in the entire police system.

This is also Zhang Yongzhi's biggest support when facing Qin Yong.

Over the years, the Criminal Investigation Team has often sought the help of the traffic police team for tire trace analysis on multiple occasions.

But since when did the criminal investigation produce such a figure?

Just from a set of tire traces, being able to determine the type of vehicle, its usage time, and even estimate its brand range.

Are we traffic officers going to become redundant?

Compared to Zhang Yongzhi's shock, Qin Yong is more concerned with the case itself and Lu Chuan's accuracy in analysis.

"Lu Chuan, do you want to go over and check the collision point site?"

Lu Chuan nodded: "I'll wait until my colleagues from traffic police are done, then I'll go over and do some data collection."

"It's about done," Zhang Yongzhi shook his head: "The traffic police have already finished over there, Lu..."

"Captain Zhang, my name is Lu Chuan."

"Oh, Lu Chuan... I'm older, so I'll just call you Lu."

Though Zhang Yongzhi is of the same rank as Qin Yong, his position and police rank are much higher than Lu Chuan, but since Lu Chuan is not from the traffic police, he has no jurisdiction, and he speaks very courteously.

Moreover, Lu Chuan's conclusions based on the tire trace analysis had already impressed Zhang Yongzhi.

When did the Criminal Investigation Team come up with someone so capable?

"Thank you, Captain Zhang, for your courtesy."

"I'll take you over there; the tire traces at the collision point are clearer, and the information on the impact is more comprehensive."

"How's your investigation going over there?"

Near the collision point, several traffic police officers conducting on-site traffic accident investigations had indeed completed their examination.

"The length of the tire skid mark is 5.58 meters, the distance from the starting point of braking to the collision point is 4.13 meters, and the skid mark after impact is 1.45 meters long."

This is why Zhang Yongzhi mentioned that the brake marks at the collision point provide more comprehensive information regarding the impact.

In all traffic accidents, if there was a prior brake but still a collision occurred, it indicates that the braking distance was too short and the vehicle did not stop before the collision.

Generally, the braking process is linear, and the entire brake mark is continuous.

However, at the moment of impact, due to the obstruction of an object or person, the vehicle's speed will undergo a non-linear change.

A portion of the vehicle's kinetic energy will be transferred to the struck person or object during the impact.

The struck person or object might be thrown, causing injury, and the vehicle's speed will sharply decrease.

At this point, the brake mark will have a break, and by observing the proportion of the brake mark length before and after the break, it's possible to calculate the vehicle's speed during the collision and when the brakes were applied.

"Preliminary judgment is that the speed at the time of impact was ninety kilometers per hour, and at the start of braking, it was likely at least one hundred thirty kilometers per hour."

"Longjiang Road's design speed is eighty kilometers per hour; the vehicle involved was in a state of severe speeding."

The traffic officer responsible for this traffic accident site investigation was Wang Zhiyuan.

He's a top expert in accident scene investigation in the traffic police team, with very rich experience.

He can deduce the approximate situation at the time with just some rough data.

"What characteristics does the vehicle have?"

Having just been shown up by Lu Chuan, Zhang Yongzhi also wanted to do some face-saving in front of Qin Yong.

"At the impact moment, the front and rear breakpoints of the four-wheel friction marks are 2850 millimeters; this is the wheelbase of the offending vehicle."

"The debris scattered on the road is from the offending vehicle's bumper, white in color."

Wang Zhiyuan pointed to the largest piece of debris marked with a number one by the roadside: "From the position where Song Kun was hit, above the waist area, we can determine the offending vehicle is an SUV."

"And here," Wang Zhiyuan squatted down, pointing to the end of the tire scuff mark: "After the collision, the vehicle left the scene, and there are four-wheel drive marks, which only a four-wheel-drive vehicle would have."

"Considering these traces, we can conclude the offending vehicle was a white four-wheel-drive SUV, and the specific model should be a Ford Endeavour."

Wang Zhiyuan's judgment on vehicle information aligned with that of Lu Chuan.

A white four-wheel-drive SUV.

However, Wang Zhiyuan's judgment included a specific model!

This surprised Lu Chuan a bit.

However, it was clearly not the right moment to step forward and inquire.

At least, not the right time for Lu Chuan to ask.

Qin Yong had also been listening to the report; the conclusions drawn by Wang Zhiyuan and Lu Chuan, although achieved differently, both pointed towards a white four-wheel-drive SUV with a 2850-millimeter wheelbase.

Wang Zhiyuan took it a step further, pinpointing the exact model of the vehicle.

"Old Wang, how did you determine the specific model of the vehicle?"

Qin Yong and Wang Zhiyuan had known each other for a long time, having frequently interacted in past case-related matters.

"Captain Qin, it's this thing."

Wang Zhiyuan once again pointed to a large piece of white bumper debris by the roadside: "Each vehicle model has a different appearance, and the specifications of the bumpers also differ."

"Just from this piece of bumper debris, I could tell it belongs to a Ford Endeavour."

Qin Yong nodded.

Lu Chuan also nodded.

This is the advantage brought by experience.

Lu Chuan, though he deduced a lot of basic information about the vehicle from tire traces, couldn't identify the exact model due to unfamiliarity with vehicle models.

Wang Zhiyuan, however, had been dealing with traffic accidents for over twenty years, and with just one glance at the bumper debris, he could identify the car.

The subsequent tasks were straightforward.

Lu Chuan began gathering data on tire traces near the collision point.

"How is it going?"

Though Liu Guodong wasn't very familiar with tire trace identification and analysis, he was certainly competent with some basic crime scene investigations.

Lu Chuan knew what Liu Guodong was asking about: "It matches the tire tread of the vehicle around the corner, with consistent wear levels."

Picking up a bit of residue, Lu Chuan smelled it and gently crushed it: "Same texture, trace within three hours, it can be confirmed to be the same vehicle!"

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