Led traffic signal, you need to know more about it
I believe that everyone knows that led traffic signal has three distinct colors which included red, yellow and green traffic signal light, but if your knowledge is limited to these, that is not enough to have a better cognition about led traffic signal. I would like to share some information with you.
For many years now, the led traffic signal on major roads has been 'traffic actuated. This means that there are sensors of one type or another that can tell if vehicles are approaching, or waiting at an intersection. These sensors notify the intelligent traffic signal controller, which is really a miniature computer. The intelligent traffic signal controller then adjusts the signal timing according to traffic conditions. Most newer signals have this capability, even if they're not on a busy highway.
A basic understanding of how this works can help you get a green traffic signal light faster, or even make an already green light wait for you to get through it.
Here, I would like to give a quick description of the most common sensor.
The most common sensor is the 'loop detector'. This consists of a groove cut into the pavement, usually a fairly large rectangular shape. Several wraps of copper wire are placed in the groove to form a larger coil, or 'loop'. The groove is then filled in with asphalt or tar. They are easy to spot, especially in left turn lanes. The loop is connected to the traffic signal light control box, and basically acts as a gigantic metal detector. A vehicle passing above the loop disturbs its magnetic field, putting in a 'call' to the intelligent traffic signal controller.
After what I have said, do you have a clearer cognition about led traffic signal? Though it is so mysterious, I believe that if we are willing to do some research about it, then it will help us a lot in our daily life.
