cameras are observing the intersection (position doesn't matter)
like in this video http://de.youtube.com/watch?v=b88yD-02ANY
a software can track the position of cars and pedestrians.
with an infrared camera this also works at night:
http://de.youtube.com/watch?v=bQPUzPXKRuU
different temperatures let the system know wether it's a car or human
the software calculates the exact position of all road users and decides on a lighting scenario
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