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Optimal routing in urban transit networks, where variable congestion levels often lead to stochastic travel times, is usually studied with the least expected travel time (LET) as the performance criteria under the assumption of travel time independence on different road segments. However, a LET path might be subjected to high variability of travel time and therefore might not be desirable to transit users seeking a predictable arrival time. Further, there exists a spatial correlation in urban travel times due to the cascading effect of con