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From top to bottom, the following is the proper order for traffic lights:
pennsylvania traffic signal ahead blank road sign
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.
Answer Statistics
15.07 % of our users get this question wrong.
This question's difficulty is Medium

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