EXPERT-SYSTEM OF ACTUATED CONTROL FOR TRAFFIC AT ISOLATED INTERSECTIONS (EXACT) .2. TESTING AND EVALUATION

This paper describes the testing stage of the knowledge base of the ex pert system EXACT (EXpert system of ACtuated control for Traffic at is olated intersections). In Tests by two parties (our expert and externa l experts), more than eighty percent agreement was found between EXACT 's solutions and the two parties' solutions. EXACT was developed to as sist traffic engineers in selecting the appropriate type of traffic-ac tuated controller and its associated features, the type of detector an d its configuration, and time settings at a particular intersection. T he development of EXACT, including the identification of variables, sh ell selection, knowledge acquisition, knowledge representation, and kn owledge-base development, was presented in earlier papers.