With the expansion of inner-city networks and highways and the impossibility of closing the path for the construction of induction loops, as well as the high maintenance costs of loops, video sensors based on new technology have been introduced to the market for several years.
In the early years, these sensors had a very high price and in addition, in bad weather conditions and at night, they would have errors in car detection, but in recent years, on the one hand, the supply price of video sensors has dropped significantly and on the other hand, the impact Atmospheric conditions have also been raised in them. These factors have led to video sensors gradually replacing induction loops.
In each of the paths leading to the intersection, a camera is installed that can be defined on the received image, 8 detection zones (Detection Zone) in a form exactly similar to the loop, which are combined with each other and 4 output commands for They send the intersection controller (a total of 16 outputs for the intersection).
Each of these detection areas replaces an induction sensor (ring) and detects the presence of a vehicle and provides it to the intersection controller in a pulse. Adjusting the dimensions and position of the detector zones on the image is easily done by the software program that is responsible for programming the sensor.