A large part of boat traffic is dominated by factors that cannot be
determined exactly through environmental characteristics (many
decisions about where boats go are due as much to the caprice of the
boaters as to environmental conditions). A model based on (biased)
random events is needed to adequately capture this aspect of boat
traffic, similar to the queuing models mentioned on page
. Since it is not known beforehand what
routes boats are going to use, it is required that a model be able to
recreate boaters' paths as well as the times that trips were made.