A modular construction system that can be used to construct a variety of structural units including armor shields for vehicles or personnel, energy generating grids, thermal insulating or transmitting structures, acoustic insulating or reflecting structures, electromagnetic shields, etc. While a time-measuring start signal \u201cSIN\u201d is entered into a path switching means, the path switching means is connected to either a first timer section or a second timer section under control of an external-access-operation-start-request signal REQ and a refresh-operation-start-request signal REQ. The invention relates to phosphate and sulfate scale. As a result, it is possible to control the behavior of the vehicle in accordance with preferences of the driver during automatic following control execution.