In congested waters, the traffic control is required for improving the safety and the traffic capacity. In the previous report, the methods of the traffic control on the crossing points were considered, and then the effectiveness was verified. Even if the traffic control is optimum for the each crossing point, it is not always suitable for all over. Whether the control on the double crossing is to be systematic or not is decided by the distance between the crossings and traffic density, etc. Therefore in this report, the authors investigated how to divide the control area, using the results of the traffic flow simulation on the single and double crossing. (Fig.1) Traffic control on the continuous crossing is available to be individual each other on condition that the distance between the crossings ( D_c ) is larger than D _min : D _min is defined as the minimum distance in which all ships are able to adjust the passing time. if D_c is less than D _min, the traffic capacity is improved by systematic control. As the large ship is difficult to adjust the passing time in the short distance, it is useful to apply the systematic control for large ship only. This combined control system decreases D _min, to 80%. In the many congested waters, the traffic flow will be improved by these control systems.