A control unit for improving the use, simplifying the maintenance, and organizing the management of floor maintenance equipment. The invention analyzes commands issued to active disk drives in a disk arraystorage network, and issues commands to the hot spare drives which attempt to emulate the track usage patterns of the active drives. Thus observations made by the driver during his trip can be stored in the database as traffic information and used for updated route planning. A sensing elements is designed for sensing the relative moisture of the soil in at the pot. The process room includes a plurality of chambers arranged along the second and third barriers. The control system comprises a plurality of light element controllers, each connected to a respective light element, and arranged to obtain light element data; and a bus interface, which is connected to the light element controllers via a light source bus.