In the past four decades, the route choice problem, along with the traffic assignment problem, has
been considered by a large number of authors worldwide. Teodorovic and Kikuchi (1990) [41]
were first to model the complex route choice problem using fuzzy logic. They used fuzzy
inference techniques to study the binary route choice problem. Akiyama et al. (1993) [2] also
developed a model for route choice behavior based on the fuzzy reasoning approach. Lotan and
Koutsopoulos (1993a, b) [22, 23] developed models for route choice behavior in the presence of
information based on concepts from approximate reasoning and fuzzy control. The research of
Lotan and Koutsopoulos (1993a, b) [22, 23] is particularly important within the context of
ongoing research in Intelligent Vehicle Highway Systems (IVHS). Teodorovic and Kalic (1995)
[40] developed an approximate reasoning algorithm to solve the route choice problem in air
transportation. Akiyama and Tsuboi (1996) [4] studied route choice behavior by multi-stage fuzzy
reasoning.