A thorough analysis is presented of how expert systems and existing simulation, evaluation, and optimization models in traffic and transportation engineering can be combined. The problems and shortcomings of the currently available computerized models are discussed, and potential applications of expert systems in curtailing these shortcomings are analyzed. Different taxonomies and configurations of how expert systems and other computerized models may be combined are shown, and the advantages and disadvantages of each configuration are stated. Finally, an application problem in transportation issues dealing with disaster evacuation and response planning is presented. It is concluded that expert systems and other computerized models work best when combined together to create intelligent computer programs.