Traffic lights are devices used in street intersections or pedestrian crossings to control vehicular traffic and keep pedestrians safe. They are highly helpful for uninterrupted and orderly movement of vehicles and pedestrians during heavy traffic on the streets. They play a major role controlling the traffic during peak hours with no traffic policeman.
There are three stage and four stage traffic lights in use. You can get familiar with traffic rules and road items on http://www.settraffic.com/.
Ordinarily, a traffic signal system has three lights. A green light on the base of the signal light pile indicates that the traffic to move; a yellowish light in the center welcomes visitors to slow and prepare to stop, and a red light on the top to signify the traffic to stop.
Traditionally, traffic lights have incandescent halogen bulbs. These traffic lights have a whole lot of energy. They’re controlled by microcontrollers. With the debut of light-emitting diodes (LEDs), these conventional traffic lights are being replaced with LED traffic lights.
The main benefits of LED traffic lights are that they are brighter; they conserve energy and have a longer lifespan. Based on size and color, they have between 8 and 25 levels of energy. However, in the case of incandescent light bulbs, their energy usage is between 67 and 150 watts.