Publication Date



Technical Report UTEP-CS-07-04


In modeling drivers' route choice in stochastic networks, several researchers have successfully used exponential disutility functions. A usual justification for these functions is that they are consistent with common sense and that they lead to simpler computations than several other alternative disutility functions. In principle, such a justification leaves open a possibility that there is some other (yet un-tried) disutility function which is also consistent with common sense and for which the computations are even simpler than for the exponential function. In this paper, we prove that exponential disutility functions are the only ones that are consistent with the (appropriately formalized) common sense and the only ones for which computations can be simplified.