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The other day I was driving home.  I always seem to miss a left turn
light and have to wait for it to turn green again.  It seems to take
forever.  I thought it would be nice to know just how long the light is
red before it turns green again.  Unfortunately I didn't have a clock
with a second hand handy.  I was however able to figure out how long the
light was red within about a second, but not until I got home.   Any
ideas as to what I did?

[[RecPuzzlesTiming a Traffic Light Solution]]
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