This Function shall be capable of providing the following facilities:<br/><br/>(1) A HMI through which the Traveller can request the implementation of a trip plan, be given trip navigation instructions or manage changes to the trip plan that is currently being implemented.<br/>(2) The ability for the HMI to output in whatever form best suits the Traveller the instructions for implementing the trip plan that are provided by the Implement Trip Plan and Track Traveller function.<br/>(3) If a proposal is received for revising the trip plan that is being implemented, the ability of the HMI to display details of the proposed changes to the Traveller and send back the response that is received to the Manage Revised Trip Plan Creation for Traveller function.<br/>(4) The ability for the HMI to receive requests for changes to the trip plan from the Traveller and also send them to the Manage Revised Trip Plan Creation for Traveller function.<br/>
(a) continuously monitor for receipt of the trip plan implementation data flow;<br/>(b) when the data flow in (a) is received, put the contents in the implement trip plan data flow and send it to the Manage Store of Trip Plan Data function;<br/>(c) as a result of (b) continuously monitor for receipt of the trip guidance instructions data flow;<br/>(d) when the data flow in (c) is received, output the instructions to the Traveller in the most appropriate form using the route guidance information data flow;<br/>(e) continuously monitor for receipt of the trip plan changes for Traveller data flow;<br/>(f) when the data flow in (e) is received, output the details of the changes to the Traveller in the implement trip plan changes data flow;<br/>(g) as a result of (f), continuously monitor for receipt of the trip plan change data flow;<br/>(h) when the data flow in (g) is received put the contents in the trip plan changes response data flow and send it to the Manage Production of Revised Trip Plan function;<br/>(i) continuously monitor for receipt of the request implementing trip plan change data flow;<br/>(j) when the data flow in (i) is received, put the contents on the trip plan changes request data flow and send it to the Manage Production of Revised Trip Plan function;<br/>(k) repeat (d) and (f);<br/>(l) continuously monitor for receipt of the GTP data updates data flow;<br/>(m) when the data flow in (l) is received, send the data to the Evaluate Trip After Completion function in the trip results from traveller data flow.<br/>