Drivers of big trucks really don't step on the brakes in case of emergency.

Braking can't reach the level of a family car

The braking distance of a large truck is much longer than that of a family car, so it is useless to brake suddenly in many cases.

the federal motor vehicle transportation safety administration of the United States has a saying: a fully loaded commercial truck travels at a speed of 65 mph, that is, 14 km /h, and it takes 183m to stop completely. It is equivalent to the length of two football fields. As a comparison, the speed of ordinary cars is 1km/h, and the braking distance is generally about 4m;

the problem of overload makes braking more difficult

it is already difficult for a truck with normal load to brake, and it is even more difficult for a truck with overload. Anhui University of Science and Technology has a master's thesis, "Cause Analysis and Management System Research of Highway Freight Overload under the Background of Modern Logistics". It made a survey: among 362 truck drivers, 91.71% were lucky, so they were overloaded. Among the people who are overloaded, 81.22% choose to overload in order to get more profits.

the reason is: because the freight cost is too high, it is a state of losing money. In order to survive, not overloading means losing money. If you can gamble on overloading, there is nothing you can do.

The braking distance will be longer after the truck is overloaded.

The master thesis of Henan Agricultural University, The Harm of Truck Overloaded Transportation on Highway and Its Impact on Economic Benefits, said above.

when the truck is running at 3km/h, the braking distance of the truck will be increased by .5-1m for every ton of goods overloaded. Moreover, the braking distance increases with the increase of speed. When the speed is 5km, the braking distance is about 3 times, 3 times and 3% of the speed of 3km/h! At a speed of 9km per hour, it will reach about 1 times. Therefore, the driver of the big truck didn't say that he didn't step on the brakes. He stepped on the bottom, and the car couldn't stop immediately like a car, which means the probability of an accident is higher.

The configuration of domestic large trucks is low

Large trucks can't stop, partly because the vehicle configuration is not high enough. There is a paper in the journal Commercial Vehicle, which reads "Interpreting the Value of the Auxiliary Brake System of Scania Truck".

in order to make up for the problem of insufficient braking of freight vehicles, auxiliary braking systems such as engine retarder, eddy current retarder and hydraulic retarder are generally installed on freight cars. Among them, the effect of hydraulic retarder is quite remarkable, which can play a role together with the brake in emergency braking to reduce the braking distance.

in fact, there are very few trucks equipped with hydraulic retarder on the road, and even fewer are brought by the original factory. There is a paper in the journal Commercial Automobile, which says that the implementation of the new national standard brings new opportunities to the hydraulic retarder market. In 216, the sales volume of hydraulic retarder was only over 1, units, and the sales volume of heavy trucks was 732,9 units, so the market coverage was very low.

The blind area is too big, so some accidents that you didn't see it directly hit it. On the surface, it seems that the truck did hit it directly without stepping on the brakes. But in fact, it is because the blind spot of the big truck is too big to see. There is a paper in the journal Jiugang Science and Technology, and the solution to the blind spot of heavy trucks is mentioned above.

The blind spot of heavy trucks is one of the main causes of traffic accidents. It's not that they didn't stop, but that they didn't see it. The blind spots of heavy trucks mainly include: the blind spots of the front, A-pillar, front wheel, rearview mirror, rear end and inner wheel difference. You see, there are many more blind spots than our cars.

according to the paper on china safety science journal, the formation mechanism of the blind spot of truck turning right and the study of intersection safety. What is the blind area when a 6-axle truck turns right? Guess what? 4.39㎡！ It is equivalent to the whole right side, and the whole right side of the car is all "black" and invisible.

So, we shouldn't squeeze with big trucks at ordinary times. Many times, pedestrians and cars are just like ants in front of big trucks, and they are simply invisible. It's not that people don't like you today, but they can't see you.

So, you see, there are many big trucks with a sign posted on the back: Stop before turning right, please forgive me. Just let the car behind us be patient. Why did people stop? Look as much as possible, and then turn around if there is no problem.

"I'd rather kill someone" is a rumor.

Let's put it another way. It's impossible for a big truck driver to take the way of "I'd rather run into it than put on the brakes", because the driver's accident cost is also very high.

First of all, in the case of no death, handle the accident: impounding the car and impounding the license. It means that before the accident is solved, there is no food, no salary, no work, and compensation for the delay of the goods, right? This is already very serious.

and if the accident is serious, the driver may face more than just economic losses. Article 11 of the Road Traffic Safety Law violates the provisions of laws and regulations on road traffic safety. If a major traffic accident occurs and constitutes a crime, criminal responsibility shall be investigated according to law, and the traffic administrative department of the public security organ shall revoke the motor vehicle driver's license and directly hang the license. Moreover, according to the regulations, if one person is killed or more than three people are seriously injured, and they are fully or mainly responsible for the accident, or if more than three people are killed and bear the same responsibility for the accident, they will be sentenced to fixed-term imprisonment of not more than three years or criminal detention. This is very powerful.

if it causes death and does not constitute a crime, according to the regulations on the application and use of motor vehicle driver's license, it is also necessary to downgrade and renew the driver's license, so you can't drive this thing in the future.

The root cause of frequent accidents is that the brakes can't stop

In a word, stepping on the brakes is an instinctive reaction of people, and it is impossible to directly bump into someone and a car in front. Big truck drivers who don't obey the rules and drive indiscriminately are really a very small number. There are quite a few friends who look at my truck driver. I also chat with them in the message area.

Generally speaking, people who drive cars are gentler, more hard-working, more affectionate and more responsible than us. I'm here to talk about it for them, which is really not easy. The most fundamental reason for the frequent accidents of large trucks is that they can't stop. There are economic and technical reasons.

Should drum brakes be eliminated

At present, most of the large trucks on the market are still using drum brakes, which is of course one of the reasons why the brakes can't stop. Should drum brakes be eliminated? Why are some family cars also in use?

to make the car brake faster, can I pull up the handbrake when I step on the brake? Will the braking distance become shorter? Isn't there a mechanical hand brake and an electronic hand brake now? What's the difference? Which one is more suitable for us to use?