This Function shall be capable of providing the following facilities:<br/><br/>(1) A HMI through which the Travel Information Operator can set up, view and modify criteria used to prepare and/or modify trip plans requested by Travellers.<br/>(2) It shall be possible for these criteria to ensure that all trip plans conform to travel and traffic management policies (if any) for the road network and the appropriate use of the available transport modes.<br/>(3) The HMI shall not enable the Operator to have access to the personal data about Travellers or Freight Vehicle Drivers who either have made, or are in the process of creating trip plans, or to be able to identify which Travellers or Freight Vehicle Drivers are currently preparing particular trip plans.<br/>
(a) continuously monitor for receipt of the input data flows from the Travel Information Operator;<br/>(b) when the update trip planning criteria data flow is received in (a) send the data to the Plan Traveller Trip Details function using the update trip planning criteria data flow;<br/>(c) if the request trip planning criteria data flow is received in (a), send it to the Plan Traveller Trip Details function in the request trip planning criteria data flow;<br/>(d) as a result of (c) monitor for the receipt of the requested trip planning criteria data flow;<br/>(e) when the data flow in (d) arrives, output its contents to the travel information operator in the output trip planning criteria data flow.<br/>
