(1) The methodology is virtually valid for any statistical
distribution with a known mean, either theoretical,
for example, Normal, Log-Normal,Weibull, Gamma,
and so forth, or experimental, in which historical
data could be used to model each edge’s travel time.
Also, the methodology can be naturally extended
to consider different distributions for different edges
and possible dependences among these travel times.
The methodology is thus developed because in the
practical situations travel time between any pair of
nodes can be different from day to day even at the
same time of a day and theremay be some correlations
among travel times of multiple routes, which, to our
knowledge, cannot be easily dealt with by the existing
methodologies.