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From top to bottom, the following is the proper order for traffic lights:
pennsylvania traffic signal ahead blank
A.  Red, yellow, green.
B.  Red, green, yellow.
C.  Green, red, yellow.
D.  Green, yellow, red.
On a traffic signal arranged vertically, red is always on top and green on the bottom. When arranged horizontally, red is always on the left and green on the right.
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