There are cameras at the fork in the expressway
The first speed camera is a shape like a rectangular box, play a decisive role is actually connected with the radar module. Radar detection vehicle over speed will be linked when the camera to take pictures of evidence. The speed radar uses the Doppler effect principle. When the vehicle approaches the radar antenna, the reflected signal frequency will be higher than the transmitter frequency. When the vehicle is away from the antenna, the reflected signal frequency will be lower than the transmitter rate. This can be calculated by the frequency of the value of the target and the relative speed of the radar.
Highway cameras are generally high on both sides of the road, it is easy to see. Fixed speed device with radar speed function, video surveillance equipment with automatic capture reversing, parking, retrograde, parking up and down and other functions, high-definition bayonet equipment with radar speed, capture carts, not seat belts, 2:00 to 5 Point bus pass pictures and other functions. Highway monitoring system common three kinds of products:
The second is the security card mouth camcorder, the public driving through this camera often found that regardless of speed will flash lights take pictures, in fact, encountered this situation and do not panic. Its main role is to import and export vehicles and personnel to monitor the investigation of suspicious vehicle screening clues to help Interpol and other staff to trace the staff involved. This camera appearance and speed camera no significant difference.
The third is to monitor the camera, this camera has a spherical, cylindrical, square box and so on. Some of these cameras with LED lighting device, at night to keep the light to ensure that the camera vision clear. Set the purpose of these cameras is mainly to capture the various types of information applied to the security prevention and control, according to the image records that the facts of the case, locked so that arrested all kinds of criminal suspects
