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They are set on timers.

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Q: How do stop lights know when to change colors?
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Related questions

Why do green leds on modern stop lights fail before leds of other colors?

Maybe it's used more? I don't Know.


Why do the colors on the stop light changed colors?

They change colors to show you what to do on the street. Green means go and that everything is O.K., Yellow means slow down and warns you that you will have to stop soon, red means stop and that it is not safe to keep going, flashing yellow lights are ment to tell you to slow down and be careful, and red flashing lights are meant to be used as a stop sign were you have to wait for others to pass to be able to get through it's also a warning sign for high traffic.


Why were street lights invented?

so people can know when to stop and when to go


Will the capacitor stop car lights from dimming while amp is in use?

when i play music in my car the lights dimm i wanted to know if a capacitor would stop that problem


Why the traffic lights comprises of red yellow green colors alone?

Much thought went into the selection for the colors in Stop, Go, Caution lights, they however weren't for traffic lights, they were for the Railroad and devised by their engineers through a trial and error method, the glare of the sun played a large part in the final selection of colors. The life-saving ingenuity of the Railroad Engineers are responsible for the traffic light selection of colors.


What is the fine for failing to stop for a school bus with it's flashing red lights on and stop arm?

i dont know sorry


If there was no streetlights and no lights on the man's car how did he know to stop when the lady crossed the road?

it was daytime? ...


What do you do at a cross walk with plinking red?

You stop ! The blinking red indicates the lights are about to change to green for the traffic.


What is a spectral signature?

A spectral pattern is basically a line of dark or bright colors that continue on and never stop. These patterns and lines can be used to identify gases and lights.


Why wont gear shifter change gears on steering coloum?

Linkage broken or disconnected? Vehicle stuck in "Park"? Check to see if stop lights are working - shift interlock and stop lights same circuit - check fuse


2002 Chevy Trailblazer wants to cut off when stop at red lights or stop signs or it will jerk forward does anyone know what is causing this problem?

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What are examples of math translations in the real world for students to identify with?

The stop lights on the road slide up or down based on the colors, but still are the same shape & size