Medium Controllers Of the local intelligent type

When scheduling traffic lights at an intersection, the first thing that comes to mind is that if the device can act intelligently like an experienced police force, the ideal scheduling can be performed at the intersection and minimizing downtime. Obviously, this requires an electronic eye (sensor) on the paths leading to the intersection so that it can detect the volume of incoming or stopped traffic on each side and increase and decrease the green time accordingly. Local intelligent command devices have this capability. These devices decide on the volume of traffic at any given time, and of course the accuracy of their work depends on the accuracy of the electronic eye that reads the volume of traffic.
One of the most common electronic eyes for traffic is sensors that are installed in the form of squares or rectangles with approximate dimensions of 2x2 meters, under the asphalt, and as each car passes through it, it sends a pulse to the device based on the distance of consecutive pulses. Indicates the amount of traffic congestion, the green time of the traffic lights increases and decreases. These sensors are known as induction loop sensors or Loop Detectors. Of course, in recent years, video sensors have also been introduced to the market and are gradually replacing induction rings.
Local smart devices work very well at intersections that have large fluctuations in traffic volume so that the traffic situation is not predictable, and also at intersections where one side is deserted and the other side is crowded. However, the cost of installation, operation and maintenance of these devices is much higher than the simple device, and these costs are more due to the volume of operations that are required in connection with the installation of sensors and their wiring.