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In fact, the camera at the intersection to take pictures of the driver running a red light can be achieved through many technologies. There is no unified standard and method in this regard, and it depends entirely on the construction unit that won the bid. Under normal circumstances, it can be triggered by radar to take a picture, and the induction coil can trigger a picture or trigger a picture through image recognition. When using the radar trigger photographing method, when the red light is on, a radar area is formed in front of the parking line, and when a car passes, the electronic shutter is activated to take pictures. At this time, the radar speed detector may work. When the induction coil is used to take pictures, the induction coil is buried under the road during road construction. When a car runs a red light, the induction coil car starts the electronic shutter to take pictures. When using image recognition technology, the white line on the ground is used as the warning area. When a vehicle runs a red light, the white line on the ground is blocked and the camera is triggered. Due to the different technologies used, no device can predict the red light running to take pictures. Unlike speed measurement, only radar laser technology is used, so radar speed detectors can fully predict speed detection.

In China, the most common radar speed measuring camera is usually installed above the highway and ring line. The single lane radar speed measuring system usually sets up a radar probe above the road to be detected, forming a warning area 5 meters long and 1.6 meters wide on the road in front of the radar. In order to reduce false alarms (usually the false alarm rate of the system is required to be less than 5%), the power of the radar will not be too large to avoid false alarms. According to the condition of the vehicle driving on the road at that time, the early warning distance of the radar speed detector will be different.

Handheld radar speedometers are characterized by low price, strong flexibility, and mobile operation, so handheld radar speedometers are the most commonly used equipment for police. According to the different transmission power, the effective speed measuring distance is between 300 and 800 meters. However, due to the fuzzy aiming used by the hand-held radar speedometer, the police will not measure the speed at a long distance according to the different conditions of road vehicles. On expressways, the speed is usually measured in the range of 150-300 meters, and on intercity highways and national highways, the speed measuring range is about 100-200 meters. If the police do not have a speed radar to produce a radar signal, the radar speed detector will not alarm.

The vehicle-mounted radar speed measurement and photographing system can work all-weather, is easy to operate and can work more comfortably. It is more and more widely equipped to the troops and highway management agencies. In order to improve the accuracy of the capture, the radar will form a warning area about 100 meters in front of the radar to facilitate speeding drivers to take pictures. Therefore, users who use radar speed detectors should pay attention to the fact that 90% of the alarms received when driving in open areas (such as national roads, ring roads and highways) are radar speed measurement.

About radar speed measurement in use, it can be divided into two categories: fixed and handheld, fixed usually combined with cameras to form a capture system. The fixed type will continue to generate detection waves when in use. However, due to the requirements of the camera and the avoidance of false alarms, the trigger area will be very close, usually about 30 meters, but it does not mean that the detection wave only travels 30 meters. Due to ground reasons, speed detection will receive waves at a farther distance and issue an alarm. For handheld radar does not continuously generate detection waves, only when the button is pressed to generate detection waves, but the handheld radar uses fuzzy aiming, so it takes more time. The principle is that the detector receives the electric wave first, and then the radar receives the reflected electric wave. The electric wave starts to calculate the speed. However, the speed measuring radar needs to receive 8 consecutive reflected signals to calculate the speed. Therefore, the ticket can be avoided when you find the measured speed and adjust the speed in time.

It is generally believed that the higher the sensitivity of the radar speed detector, the better, but the indicators for assessing the radar speed detector include not only the sensitivity, but also the false alarm rate of the radar speed detector. Because there are many electrical signals around us, the false alarm rate will increase as the sensitivity increases. It's okay to drive on the highway alone. Once you enter the city, everything will sound everywhere. The edge of the warning is a vague concept, so using the City mode will become complicated. Therefore, it is not that the higher the sensitivity, the better. The important thing is to provide sufficient warning distance. According to the actual use situation, the range of 100-400 meters can meet the use requirements. It usually takes 60 meters to decelerate from 100 kilometers, but it does not need to decelerate to 0 when speeding. It takes only a few seconds to decelerate to the normal level, so the driver also needs to continuously improve his use skills.