How exactly is it possible to speed a car that is so fast on the highway?

First, speed measurement, through the digital image processing technology analysis camera recorded by the establishment of a coordinate system according to the vehicle through the camera delineation of the field of view of the time to measure the speed, such as in the camera field of view on the road surface virtually out of two markings and calculate the actual distance, and then according to the vehicle by calculating the time of the two markings to determine the speed, the highway is relatively rare. So when you see that there is only a camera on the crossbar, don't think you can't shoot speeding.

Second, radar speed measurement, the principle of radar speed measurement is clear to everyone, the use of radar wave ranging principle to calculate vehicle speed, the most common and easiest to get hit on the highway is the radar speedometer in the picture above, anyway, I see this kind of radar will have a cold back, because they are usually installed in the isolation zone ** or the side of the road, you are difficult to find its figure, but it is always staring at you. If you don't pay attention, you will be hit. But now many electronic dogs can detect this radar signal in advance.

Some time ago, I ran Wenyuan Expressway, and there was such a speed radar on the side of the road outside the Yuanqu service area, and the electronic dog barked wildly before passing by.

Three ground sensing coil speed measurement, a certain distance on the ground buried in a number of groups of induction coils, the wheel over the coil after the start of timing, over the second coil timing end, so that you can measure the speed, if the speed is over, the camera starts to take pictures. This kind of speed measurement point is easy to find, but there is no radar transmitter on the crossbar, so many people do not think that it has a speed measurement function, and the hit index is not low. After we got off the highway, there was such a speed measurement point, and there was an old camera standing alone on the short crossbar, which was inconspicuous but had outstanding achievements.

In addition to setting interval speed measurement, instantaneous speed measurement is also installed. Instantaneous speed measurement can be detected very precisely in case of overspeeding at a certain moment. In other words, for some cases of fast and slow, instantaneous speed measurement can very accurately detect speeding vehicles.

Mainly for vehicles that are very fast at the beginning and slow down in the later stage, as long as they exceed the speed limit at a certain time, then the instantaneous speed measurement will be recorded as speeding.

The speed measurement coil is 2 coils in the corresponding lane, one before one after the other, for example, the two coils are 5 meters apart, your car passes through the first coil, the car detector will detect, 1 second after your car reaches the second coil, the speed at this time is 5 meters per second, when you reach the second coil, the camera will take a picture of you, the road camera is actually a simplified version of the SLR camera, the electronic shutter can do one ten-thousandth of a second, even if you run 300, you can shoot a clear **, Because its lens is a fixed focus of 25, 35, or 50mm, there is no problem with the second coil of fixed shooting, and there is no focusing problem.

**The vehicle detector is calculated by the camera and the image processing software on the image of the vehicle passing state and speed, so as to obtain the vehicle speed, but its cost is high, the adaptability is poor, and it is greatly affected by environmental factors, and is not suitable for China's national conditions, and can not be used at night, etc., and is not widely used.

The induction coil detector is a toroidal coil buried in the road ground, after the power is on, the inductance coil is formed, the vehicle is a huge metal object, and the state parameters of the coil will be changed after passing, so as to identify the vehicle and vehicle speed.

Microwave is to install microwave radar on the high pole on the side of the road, continuously emit and receive the reflected microwave to achieve the purpose of identifying the vehicle and vehicle speed.

There should be a special instrument for the calculations.

This kind of thing can only be understood by the people involved, and it is quite accurate anyway.

That's the power of technology.

Anyway, this thing is quite accurate.

It's the kind of thing that only the people involved can understand.

An inductive coil is formed, and the vehicle is a large metal object that changes the state parameters of the coil after passing through it, so as to identify the vehicle and vehicle speed.

The speedometer on the high-speed highway measures the instantaneous speed.

Highway speedometers measure speed according to the Doppler effect.

Principle: When the target approaches the radar antenna, the reflected signal frequency will be higher than the transmitter frequency;

Conversely, when the target moves away from the antenna, the frequency of the reflected signal will be lower than the probability of transmission.

In this way, the relative velocity of the target and the radar can be calculated by changing the frequency.

What are the types of speed measurements on the highway and how to distinguish them? 1. Radar microwave speed measurement Its principle is to use a variety of orange frequencies of microwave to hit your car, according to the reflection time to measure the speed of the car, can be divided into fixed and mobile two, mobile is the common hidden in the side of the road mobile speed radar and installed on the police car speed radar, fixed generally installed in bridges and intersections, tunnels and other dangerous areas. Radar speed measurement is commonly used on highways, national highways, and urban peripheries.

At present, China's leading mobile speed measurement radar all adopts the microwave radar speed measurement method, which has more than 80% of the total application of electronic eyes. Radar velocity measurement has been used internationally for more than 20 years, and the technology is mature and the cost is low. Judging from the current situation, major cities and highways in China have forward and reverse radar speed measurement equipment, and forward speed measurement devices are the majority on highways.

Reverse speed measurement means that the radar wave and the camera direction are consistent with the direction of the car, and the camera takes pictures of the vehicle's rear license plate when the vehicle is speeding. Positive velocity measurement is the opposite. 2. The principle of the speed measurement of the magnetic ground induction circle is to bury two pressure sensors on the road surface, and judge the speed of the vehicle according to the time when the front and rear wheels press through the sensors.

It is commonly found at traffic lights on national highways and in cities. This speed measurement point is very easy to identify, it is a telephone pole type, and during driving, you can see the photo spot from a distance by relying on the naked eye, especially at night, and there are very bright searchlights turned on. When looking at the pole-type photo spot, just press the brakes and slow down the car.

This method is generally common at the entrance and exit of the city, and each car entering and leaving the city is photographed and monitored, which is convenient for the use of ** investigation. Since this system does not emit any radar microwaves, all radar detectors in the world do not warn about this system. That's the relevant law about your problem.

In order to monitor whether drivers comply with the speed limit, the traffic control department has installed weekly speed meters on the road. The car is approaching the speedometer placed in the middle of the road at a constant speed, and the speedometer sends two short ultrasonic signals to the car. The time taken from the first time the signal is sent to the speedometer to receive the signal reflected back by the car, and the time it takes for the second time to send a signal to the speedometer to receive the signal reflected back by the car.

Speeding penalties. If the speed limit is exceeded by less than 10%, a warning will be given. If the speed limit is less than 50 kilometers per hour, and the speed exceeds 10% of the speed of the standard or less than 20% of the old cave hunger, a fine of 50 yuan will be imposed. If it exceeds 20% or less than 50%, a fine of 100 yuan will be imposed.

Road buses, tourist buses, civil explosives transport vehicles, and hazardous chemical transport vehicles shall be fined 200 yuan if the speed exceeds 50% per hour. If it exceeds 50%, a fine of 500 yuan shall be imposed, and a fine of 200 yuan shall be increased for each additional 5 kilometers, but the maximum shall not exceed 2,000 yuan.

In the process of driving on the highway, due to the smooth road, many "old drivers" may be speeding when driving, so how to measure the speed on the highway? How can I prevent it?

How is speed measured on the highway? There are four common speed measurement methods on highways:

1. Interval speed measurement. The interval speed measurement method is usually on the same road section, select a test area, lay out two adjacent monitoring points, and judge whether the speed is exceeded by calculating the time of the car passing through points A-B;

2. Radar microwave velocity measurement. Radar microwave velocity measurement is based on the distance between the object and the radar, and the signal reflected back by the radar wave to measure the speed of the car. It is mostly installed directly in front of the road or on the side of the road (in the middle of the road).

The front-facing test is to transmit two radar bands, and then judge the position of the vehicle at two time points based on the radar echoes, and then calculate the vehicle speed based on the distance from this position. The radar microwave speed measurement on the side of the road (in the middle of the road) calculates the vehicle speed by forming a triangle between the radar and the body feedback point and the lane;

3. Geomagnetic induction coil velocity measurement. The principle of geomagnetic induction coil speed measurement is to bury two coil sensors on the road surface, and judge the speed of the vehicle according to the time when the vehicle passes through the sensor, which is mostly used in the tunnel; Speed measurement is to ensure safety, don't think that knowing these speed measurement methods can escape fines, especially on the highway, drivers obey traffic laws, must remember to control the speed, according to the speed of the safe passage.

Generally, as long as you are speeding, you will be photographed, and you will not be photographed if you do not violate the rules. The camera is connected to the speed radar, senses that the vehicle passes by to take pictures, and then filters out the speeding vehicles, which is the entire lane (

There are cameras that record the distance you pass and record the time you pass by both cameras according to the next camera, so you can know your speed.

The principle of speed measurement on the highway is actually very simple, and it is not very important for car owners to deduct points because they do not understand.

The cameras on the highway have radar sensors, so you can measure your speed while taking pictures.

Interval velocity measurement, which measures speed by distance time, should look like this.

The camera can sense it, and it has the function of measuring speed, and the overspeed will be filmed.

The speed of the vehicle is analyzed by the distance of the infrared camera.

There is always a speedometer, and when the car passes by, the camera will shoot it.

The speedometer is an instantaneous speed, the sign is also an instantaneous speed, only the instantaneous speed on the highway is useful, you think about it, in order to ensure safety, do not let go of the fast car, if you drive fast in the front section, the rear section is slower than a snail, maybe the average speed is not speeding, the speed limit on the highway is to ensure safety, not even the speed is not speeding, but the situation I said is very dangerous, if you are the police will also think that he is breaking the law. I wish you progress in your studies and hope to adopt.

The speedometer is an average speed by standard, but since the speed is extremely short, it can be regarded as an instantaneous speed. The speed limit is definitely instantaneous.

Highway speed measurement measures the approximate instantaneous speed, and the speed limit sign also writes the instantaneous speed.

Obviously, it's instantaneous speed, which means that the fastest speed can't exceed that specified speed.

Many car owners have reported that driving on the highway is easy to break the rules. There are many car owners who don't know what rules and regulations have been violated, and they are inexplicably deducted points. Therefore, many car owners find it too difficult to drive on the highway.

Some drivers find it difficult to control the speed of their cars on the highway.

Could it be the time it takes to measure the distance of the unit?