Electric Technology Car News: Why is the speed limit on highways 120? Cars are designed to run at 200+

Electric Technology Car News: Why is the speed limit on highways 120? Cars are designed to run at 200+
As the saying goes, "Nine out of ten accidents are caused by speeding." Speeding is the biggest cause of car accidents. The speed limit on domestic highways is 120, but why do many cars have a top speed of over 200? Wouldn't it solve the speeding problem if the top speed was set at around 120 from the beginning? Why hasn't anyone done something that can solve the problem once and for all? "I believe many people have been confused by this problem, so let's talk about it today.


How to achieve a car's top speed of 120
 First of all, if you want the car to run at a maximum speed of only 120, there are two ways, one is electronic speed limit, the other is to develop a low-power engine. From an economic point of view, of course, a low-power engine is better.

There are several obvious advantages of low-power engines. First, the engine volume is small, which makes the interior space and body weight lighter, thus reducing the cost of manufacturing to a relatively low value. The use of materials and environmental protection can be improved. Thus, the vehicle becomes really cheap. At the same time, fuel economy will also be doubled, fuel consumption will be reduced, and the environment will naturally become better.

However, if the speed limit is so low, the engine power must be very low, and the torque will be reduced. The problem of low torque appears in acceleration. Insufficient torque will cause very slow acceleration at high speeds. For example, the acceleration time from 80 to 120 kilometers per hour will be very long, so overtaking will become very difficult and dangerous. The engine is basically operating at full load. This is not good for the vehicle in the long run, especially the engine.

Here is a formula: Torque x Speed ​​xn = Power, which means that power is determined by torque, speed and n, where n is a constant. If you want to keep the torque constant, you can only reduce the speed and n. The speed is limited and cannot be reduced too much, so you can only start with the value of n. I believe that no engineer is willing to make trouble for such a troublesome thing. And no car manufacturer will cause trouble for China's speed limit of 120.

There are also some reasons why the bottom of the car is designed so high. This is one of the "show-off" capitals of the manufacturer. It can be used to show their strength.

In fact, this is also a secret competition among manufacturers, to prove that their cars are faster than others. Besides, those rich people buy sports cars worth millions just to buy power and speed. If all cars are limited to 120 when they leave the factory, the sports car manufacturers will definitely be the first to cry.

Why is the speed limit 120 in China?
 Finally, let's talk about why China has set the speed limit at 120 instead of 160 or 100. Is there a basis and reason for the speed limit of 120km/h? Why do different roads have different speed limits? Of course there is! The speed limit of the traffic control department is based on the local road conditions and the statistics of traffic accidents over the years. In other words, they found that the accident rate suddenly increased when the speed exceeded this speed (let's assume it is 120km/h) on this section of road, so they set this speed as the warning speed. At the same time, 120 is a relatively moderate position. For example, there is an obstacle 100m away. If the speed of 120 is converted into seconds, you have 3 seconds to react at 100m, while 160 is only 2.2 seconds. According to most people, 2.2 seconds is obviously not enough, so we set the reaction time longer.

Therefore, don't think that the speed limit on the highway is just a random idea. It is the result of the lessons learned by countless predecessors with their lives and tears. Don't be blindly confident and speeding. In addition, many people think that Germany's highways have no speed limit, which is actually wrong. In Germany, 62% of the highway sections have no speed limit, and the others have clear speed limit standards. In addition to the good quality of the highways and safety guarantees, the drivers will consciously abide by the rules and regulations, but the quality of some domestic drivers is obviously not up to par, so for the safety of you and others, you must abide by the traffic rules.

As a winner of Toutiao's Qingyun Plan and Baijiahao's Bai+ Plan, the 2019 Baidu Digital Author of the Year, the Baijiahao's Most Popular Author in the Technology Field, the 2019 Sogou Technology and Culture Author, and the 2021 Baijiahao Quarterly Influential Creator, he has won many awards, including the 2013 Sohu Best Industry Media Person, the 2015 China New Media Entrepreneurship Competition Beijing Third Place, the 2015 Guangmang Experience Award, the 2015 China New Media Entrepreneurship Competition Finals Third Place, and the 2018 Baidu Dynamic Annual Powerful Celebrity.

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