What is the blue LED light above the traffic lights?

Answer A blue LED light above a traffic light is there to help police catch drivers who run red lights. Called a "red light confirmation light" or "tattletale light," the LED turns on when the stoplight t... Read More »

Top Q&A For: What is the blue LED light above the traffic li...

What Are Those Little Blue Lights Under the Traffic Lights in Central Florida?

According to Orlando’s Wesh TV2, “Little blue lights on traffic signals alert authorities from all angles that the signal below it has turned red.”

Why are red lights on the top of the light, and green are on the bottom of the traffic light?

i don't see why you would want that BUTif the traffic light was invented as with red on the bottomthen that would be normalnot sure who decided the orderand as for what would happen if some one did... Read More »

Do temporary traffic lights hold the same importance as normal traffic lights?

All government and city posted traffic signs and signals are to be treated as outlined in your DMV manual. If you go again permanent as well as temporary signs and signals, you are breaking the la... Read More »

Why Do Plants Grown Under Blue Light Grow Taller Than Under Red & Green Lights?

Plants are amazing examples of evolutionary adaptation and there's no doubt about that. Over the eons, for example, plants have been able to learn how to use specific colors within visible light to... Read More »