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On a uni-directional circular road where all vehicles travel in the same direction with varying speeds and overtaking is allowed on the entire road, what is the expected number of times (a) a particular vehicle will overtake others? (b) a particular vehicle will be overtaken by others?

In particular, what I want to find out: Is (a) = (b)? Thanks,

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    Thanks for your answers, I really appreciate your help. Can this situation be applicable to a [roundabout][1]? For example, In a multilane city roundabout where there is a minimum and maximum speed limit, can it be concluded that the number of times a vehicle gets passed by will be nearly equal to the number of times it passes ahead of (on average, using expected values) [1]: http://en.wikipedia.org/wiki/Roundabout2011-03-10
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    @Alvi: please do not use answers to make comments.2011-03-10

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