MACS. The Bridge is to be equipped with a Management and Control System (MACS), which enables the Bridge Operator to carry out the operation of the Bridge and maintenance of the Bridge structure and installations in a safe and structured manner. MACS is the overall architecture of the whole system. MACS is subdivided into SCADA and MMS. Figure 2.1 shows the overall system architecture for MACS. Figure 2.1 Overall system architecture for MACS.