This Function shall be capable of providing the following facilities:<br/><br/>(1) A HMI through which the Road Network Operator can control the management of traveller demand for transport modes.<br/>(2) The HMI shall enable the Road Network Operator to develop and implement demand strategies both off-line and in real time and to be informed of the effects of their implementation.<br/>(3) The HMI shall provide facilities that enable reports on the use of transport modes to be produced using stored data.<br/>
(a) when the first trigger input data flow is received, the command shall be checked for syntax and consistency;<br/>(b) when (a) is complete, the request shall be sent to the Function that can complete the action using the appropriate trigger output data flow selected from the first three;<br/>(c) when as a result of (b) the second or third trigger input data flows are received their contents shall be sent to the Operator using the other output data flow;<br/>(d) if the second trigger output was sent in (b) then arrival of subsequent third trigger input data flow shall be awaited;<br/>(e) when the data flow in (d) arrives, its contents shall be output to the Operator.<br/>