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Wrongful Souls on the River Beach ¡¤ Eighty-Two

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    The peripheral scene of this case is the earthen dam above the river beach that is usually ignored.  Now the evidence has confirmed that the suspect committed murder and dumped the body. Even at night, he would not be bold enough to directly carry the body and throw it into the river. Therefore, the suspect should have used transportation. This is one of them.

    Secondly, judging from the drifting distance of the body, the location where the suspect dumped the body should be far upstream of the Sishui River, which would be impossible without transportation.

    The river beach is full of soft soil, and you will fall into a deep pit if you walk on it. Except for aircraft, other means of transportation cannot drive on it. Therefore, if you want to dump the body, the earthen dam built for flood control above the river beach is the only way.  .

    The dam runs east-west and is about four meters wide. There are no guardrails on both sides. Because we didn¡¯t pay much attention to it when it was built in the early years, the whole road feels like a wavy line.

    Because the survey vehicle carries a lot of survey equipment, has a high load capacity and a low chassis, it is more difficult to drive on it than to climb to the sky, so the survey of the entire dam must be completed on foot.

    It was fine for the rest of us, but for Pang Lei, who was out of breath even when walking, it was definitely a torment.

    "On such a bad road, there are still people driving sports cars on it? They are not afraid of scratching the chassis." As soon as we climbed up the slope from the dam, we discovered a scene that surprised us.

    "Look, there are quite a few." Ye Qian pulled my sleeve and pointed to the ground.

    "I remembered one thing. Xiao Liu and I have fished near here before. There is a place in front with pretty good scenery. There are many people having outdoor barbecues there." Brother Ming pointed to the distance and said to me.

    Before coming here, I thought that almost no one came to this place except the suspects, and the damage to the scene would not be too serious, but now it seems that I thought too well.

    At the re-examination site, the trace examiners are in a leading position, because at this time, the corpses that need to be dissected have been dissected, and the materials that need to be inspected are almost done. If you want to find a breakthrough, you can only think about the trace evidence.  method, so every time I revisit the site, I feel even more stressed.

    Although I complained secretly in my heart, I couldn't let everyone down, so I opened my mouth and said, "It's okay. Although the scene may be damaged, there are rules to follow."

    After saying that, I leaned down and started to observe the tire marks on the road.

    "Xiaolong, you have to look carefully. It feels uncomfortable for me to move my feet." Fat Lei looked at the scorching sun above his head and wiped the sweat from his forehead and said.

    "Got it!" I was already anxious, but I didn't expect Pang Lei to pour cold water on me.

    Because we previously analyzed that the suspect might have used transportation to dump the body, the scattered tire marks on the road are the focus of my next research. I want to find the most suspicious one from these dense and seemingly irregular tire marks.  .

    Someone may ask, what can be found in these tire tracks?  In fact, there is a lot of knowledge here. Tire marks are a very big research topic in trace science.

    First, we can analyze the types of vehicles on site based on the number of tire marks.

    If the tire mark is one wheel, it can be judged to be a wheelbarrow. This type of vehicle is divided into a human cart and an animal-pulled cart. Because the wheelbarrow cannot maintain balance, there will be human footprints or livestock hoof prints around the wheel marks.

    If the tire marks are on two wheels, they can be identified as two-wheeled motorcycles, electric vehicles, bicycles, etc. This is easy to understand.

    If the tire marks are three-wheeled, they are mostly human-powered tricycles, three-wheeled electric vehicles, three-wheeled motorcycles, etc.

    If the tire marks are on four wheels or more, they are mostly cars with seven seats or less, small passenger cars and mini-trucks.

    If the tire marks are more than six wheels, it is mostly a three-axle or multi-axle truck.

    This is a more intuitive aspect, and there is also a more practical aspect, which is what people often call brake marks. This type of tire marks is quite common in traffic accidents.

    Before a vehicle collides with another vehicle, generally the vehicle will undergo a braking process.  During this process, the tire will change from rolling to sliding relative to the ground, and the tire marks on the ground will change from a clear tire pattern to a black trail.

    During emergency braking, because the driver will be fearful or panicked, he will often instinctively turn the steering wheel or continuously press the brakes. This often causes the wheel axle to vibrate up and down, which is manifested in bends or discontinuities in the traces.  In severe cases, the vehicle will deviate during the braking process, causing the vehicle to slide sideways and form a unilateral brake mark.

    We passedp; "Go away! I'm too lazy to pay attention to you. I'll call Brother Ming and the others." Looking at the grimace she made, I said angrily.

    After listening to my introduction, Brother Ming carefully observed the suspect¡¯s entire route.

    "Judging from the width of the wheels, it should be a mid-to-high-end off-road vehicle!"

    The conclusion given by Brother Ming is exactly the same as my judgment.  The width of the tire depends on the specification and form of the tire. The cross-sectional width of tires of the same specification is certain after inflating. Although the width of the tire mark of the same tire will change under different air pressure and load, but in this case  Said that this did not happen.

    Generally speaking, the wider the tire, the greater the grip it can provide and the higher friction it can provide under the same conditions. The greater the friction, the greater the driving force. If you pay attention, you will find that many racing cars  The tires are relatively wide, actually for this reason.  Of course, if the tires are wider, the driving resistance will increase, which will lead to higher fuel consumption, so the tires of family cars are not very wide.

    As far as this scene is concerned, the fact that the car can drive on this rugged dam shows that its chassis is very high. Coupled with the width of the tire marks left at the scene, it is not difficult to judge that it is a mid-to-high-end off-road vehicle.

    ¡°Let¡¯s go and see the direction the car turns!¡± Brother Ming said to us with a wave of his hand.  (Remember the website address: www.hlnovel.com
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