This study presents the logic for a general purpose simulation model representing an automatic guided vehicle (AGV) system integrated with traditional materal handling equipment. To accurately represent this type of system, logic includes vehicle loading/unloading and conventional equipment passing capability. The model's flexibility accommodates any combination of straight aisles and intersections through minor adjustments to the general model. The logic concepts are implemented using the SIMAN simulation language. An application is presented which demonstrates the use of the model to analyze the impact of interfacing AGV and traditional traffic upon aisle congestion and overall system performance.