Abstract
This paper describes the testing stage of the knowledge base of the expert system EXACT (EXpert system of ACtuated control for Traffic at isolated intersections). In Tests by two parties (our expert and external experts), more than eighty percent agreement was found between EXACT's solutions and the two parties' solutions. EXACT was developed to assist traffic engineers in selecting the appropriate type of traffic-actuated controller and its associated features, the type of detector and its configuration, and time settings at a particular intersection. The development of EXACT, including the identification of variables, shell selection, knowledge acquisition, knowledge representation, and knowledge-base development, was presented in earlier papers.