FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -Most traffic lights are connected by small computer chips to a wire embedded in the road which detects the presence of a car.

Detailed explanation-2: -Infrared Sensors Instead of being embedded in the pavement, these sensors are mounted overhead to detect the presence of vehicles in an intersection. The two types of infrared traffic sensors are active infrared sensors and passive infrared sensors.

Detailed explanation-3: -The traffic light has 5 input functions, one to detect an approaching vehicle from each of the directions, east, west, south, and north, and one input to detect a pedestrian at the cross walk. Their are 8 outputs, 3 for each traffic light and 2 for the crossing light.

Detailed explanation-4: -Contrary to popular belief, most traffic lights do not work on a simple timer. Most use in-roadway sensors or pressure transducers to calculate how many vehicles are at a particular intersection.

Detailed explanation-5: -The sensors are cut into the ground within the lane. “Most lanes have several and some in advance of the intersection. There are multiple levels of detection. At most intersections the front-most ones are important because they are generally more sensitive for motorcycles and bikes, ” said Mustafa.