Traffic lights are all apparatus applied in road intersections or pedestrian crossings to regulate vehicular traffic and also maintain pedestrians safe.They are tremendously helpful for uninterrupted and orderly movement of vehicles and pedestrians throughout heavy traffic to the roads.
They play the main part in restraining the traffic biennial(which is also known as “เสาจราจร ล้มลุก” in the Thai language) during peak hours with no traffic policeman.Contemporary traffic lights came to usage from early 20th century.There are just three phase and four-phase traffic lights in use.
Ordinarily, a traffic signal system contains three lights. A green light on the base of the signal light pile indicates that the traffic to move; a yellowish light at the center welcomes visitors to prepare and slow to discontinue; and also a crimson light onto the very top to signify the traffic to discontinue.
Traditionally, the traffic lights include incandescent light bulbs.These traffic lights have a whole lot of energy. They’re commanded by microcontrollers.With the debut of light-emitting diodes (LEDs), these conventional traffic lights have been substituted with LED traffic lights.
The principal benefits of LED traffic lights so that they have been more economical; they also save energy and also have a longer expected life. They absorb 83 percent less energy than incandescent bulbs. Based on color and size, they have between 2 and 25 levels of energy.However, in the instance of incandescent light bulbs, then their energy usage is between 6 7 and 150 watts.