Traffic Light Apps

Traffic light is a simple popular teaching application. Not surprising traffic light applications come up with Raspberry Pi in various ways as described here.

Usual Traffic Light :  Red=Stop, Yellow=Warning, Green=Go 

but still these traffic lights do not work the same way in all countries.  Ex: Austrian traffic light vs US traffic light  
Trivia: History of the Traffic Light

Options(HW/SW) for traffic lights on RPi: 


Other examples:

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