For most of my commute, I am on the "main road" of any intersection. There are only two such crossings where the roads are of equal size and traffic volume. Since each of those has a turn arrow, I will assume that they are only green for people going in my direction about 40% of the time. Of the remaining ten lights, only one has a turn arrow unaccompanied by a green in my direction. For that, I will assume that it is green my way 50% of the time. The final nine lights, I will estimate are green 55% of the time.
Since I hit a green with one of the lights in the last category, the odds of this happening are:
= .6^2*.5*.45^8
= 302,672,257
1,000,000,000,000
= 1
3,304
= .000302672257
= .03%
It doesn't sound insanely small, but to put this number in perspective, IF someone were to work five days a week for fifty two weeks per year (no vacation days or holidays off), they would drive the commute 260 days per year. Given that, this nearly a once in twelve year occurrence. I'm thinking I should go to AC and bet it all on RED!
-MSG
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