A proposed AGVS will operate between points A and B. In a given hour, 10 loads must be delivered from A to B, and 6 loads must be delivered from B to A. The AGVS layout will be a simple oval loop, with a travel distance between A and B of 590 m in either direction. The traffic factor is therefore 0.89, availability is 0.93, and vehicle speed is 33 m/min. The time to load is 0.8 min and the time to unload is 1.1 min. Determine the required minimum number of vehicles that will satisfy these delivery requirements.