How do stop lights work?

we see and use them everyday but how do they work?
is there similar to alittle man in a box watching the cars and pressing buttons ??


Answers:    yes. he is a wee leprachaun
Green = GO!
Red = STOP!
Yellow = SLOW DOWN!
the green one channel go
the red mechanism stop
the yellow manner slow and get set for red...
with road sensors (the ground)
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