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The probability of no cars passing within a certain time interval
Beware of "gambler's fallacy". To take an analogy, if you throw a fair dice, the probability of getting a four is always 1/6. It doesn't depend on how many times you have tossed. As for variance, it is better interpreted as a measure of a group of data instead of a predictor of probability, although we know variance is equal in value to the mean of a Poisson distribution. Of course, the ultimate reason Poisson distribution doesn't depend on variance is because of its derivation.
|The probability of no cars passing within a certain time interval|