Everyone has painted a lot of high-speed traffic jams, right? Either 1 car missed the high-speed exit and stopped in the middle of the road, intending to change lanes with a solid line, leading to an accident; Either 1 is driving very slowly, and there is a big crowd behind it. But sometimes, when the car passes by, I can't see what 1' s car is doing, or what's wrong with it. What happened? Why on earth?
Why is traffic jam easy at high speed?
The first car was too slow, which caused the ghost traffic jam. Exaggerated, in fact, as long as the car steps on a big brake in the traffic flow, it may lead to traffic jams behind it, which is a bit of a butterfly effect.
There is an article on the MIT website "MIT News", "Mathematicians focus on" ghost traffic jam ",and the new model helps to design roads better".
For example, in high-density traffic, even a small disturbance, such as the driver's excessive braking, will quickly amplify into a full-scale traffic jam. A motorcade with a speed of 40km/h suddenly has a slow train of 1 time, which may continuously affect 10 to the next 20 cars, with an impact distance of about 500m.
There are many cars on the expressway. As long as several cars appear at the same time, the overall speed will be reduced, and in serious cases, it may be completely blocked.
Inappropriate metaphor, convenient feeling: three monks have no water to drink. When all three cars have to squeeze into 1 road, the traffic efficiency will be miserable and greatly reduced. By the time we were stuck in a traffic jam, the accident car had been towed away, so we couldn't see why the car "1" was blocked? " It's not there anymore, but we are still stuck in the traffic jam.
The traffic is really too heavy.
There is also a special situation in Spring Festival travel rush, that is, from the toll station to the ramp, directly to the main road. I can't stand the heavy traffic and the wide highway. Surely you can't find a 1 car that causes congestion?
Master thesis of Mu Xiaofeng, Shanxi University, analysis and countermeasures of traffic congestion on major holidays of expressways in China.
There is an accident ahead. Once this local train said, "Hey, what did you just say?" With a bang, people crashed into it, causing an accident, so the traffic jam became more serious. For example, some two-lane expressways, even if they only slightly rear-end, occupy one lane, and the traffic efficiency drops by 65%. It doesn't mean that the two items will be changed to 1, but there will still be 50%, which is not so ideal.
Master Li's thesis of Chang 'an University, Research on Key Technologies of Traffic Guidance in Expressway Accident State.
There is a data in it: the two-lane expressway occupies 1 lane, and the capacity is only 35% of the original. On the contrary, it will drop by 65%. If the 3-lane expressway occupies 1 lane, the traffic capacity will drop to 49% of the original; It occupies two lanes, and the traffic capacity is only 17% of the original.
It says: Some highway sections are not forward-looking enough in planning and design, and if they exceed the design limit, they will become more congested. For example, the design capacity of Pingyao toll station of Qilin Expressway is 850pcu, which is equivalent to the number of standard cars. The peak traffic volume is 1060pcu/ hour, and the peak time is from 6 am to 6 pm, 12 hour. The design scale has fallen far behind the actual demand.
It is equivalent to traffic jams at ordinary times. If you encounter this kind of holiday, the high-speed is free, and the traffic jam will definitely be more serious. Don't jump the queue in traffic jam. Some friends will think, change lanes left and right, go up a little, at least faster?
In fact, when the traffic jam is serious, it is really unnecessary to do so. If you queue up honestly, the overall traffic speed will recover faster.
Yang Quantao and others published an article in the journal Science Report, analyzing the delay of vehicles in the target lane caused by vehicle lane change operation.
It says: When the traffic density is low, changing the vehicle to a faster lane will help improve the driving speed. In the case of high-density traffic flow, lane changing will affect the speed of the following car in the target lane, thus affecting the overall traffic rate of the lane. Honestly, it's blocked. If you have to drill around, it will affect the people behind you.
What people in front do will affect us, and what we do will affect the back. So what can I say? There is no traffic jam except the car in front. There is no car in front, and everything behind will be affected. This is unnecessary. People actually line up, but it's faster, and they're not in a good mood when they're stuck in traffic, are they? Squeeze around. If they wriggle around like this, they won't be allowed to pass. When you don't let me, say, "Why don't you let me?" , "don't let zha drops? I'm going to try. " Please, what if there is a fight? What if Lu is angry?
I didn't want to be famous, but what should I do if I took a short video and became famous online? It's not worth the candle at all. When encountering congestion, it is more efficient to queue up honestly.
So, in short, there are many reasons for high-speed traffic jams during the Chinese New Year. Maybe the car in front braked, or maybe there was a slow train in front, which caused everyone to be completely blocked.
In addition, when the traffic volume is too large and the high-speed planning itself has problems, the objective reasons for traffic jams also exist. Don't worry too much when there is a serious traffic jam. It's no use worrying. The queuing efficiency is the highest.