Low Level Function
4.4.5 Optimise PT Fleet Control
Overview
This Function shall be capable of providing the following facilities:
(1) The ability to optimise actions to improve the reliability and schedule adherence of PT services, due to such events as changes in Passenger numbers (e.g. high demand), PT Vehicle breakdown and incidents that have occurred that affect the flow of traffic through the road network.
(2) The ability to change the current way that PT services are being operated, including sending revised instructions to PT Vehicle Drivers, and introducing extra PT Vehicles to support those already delivering the current services.
(3) The ability to send to other functionality requests PT Vehicle priority for late running services or individual PT Vehicles and additional Vehicles added to services when Traveller demand is high.
(4) The ability to exchange data with the functionality providing the HMI that enables the PT Operator to monitor and manage PT service delivery.
(5) The ability to exchange data about PT service operation with other instances of PT management functionality,
(6) The ability to interact through an interface function with other transport modes to enable co-operation on the maintenance and variation in PT services
(7) The ability to use both real-time and historic PT Vehicle data in its actions and to record service information in the Store of historic PT Vehicle data.
Functional Requirements
(a) continuously monitor for receipt of the updated service delivery criteria data flow
(b) when the data flow in (a) is received, store the data that it contains for internal use within the function and send it to any other instances of this function in the control parameters data flow
(c) continuously monitor for receipt of the actions report request data flow
(d) when the data flow in (c) is received collect the data needed fro the report from internal data stores plus the stores of Real Time PT Vehicle Status Data, Historical PT Vehicle Data and PT Service Plan Data and send it to the Provide PT Operator Interface for Fleet Control function in the requested action report data flow
(e) when either of the observed performance figures or the passenger numbers at stop data flows is received, store the data for internal use within the function
(f) when the incident details data flow is received, carryout an assessment of the need for changes in the PT services currently being provided
(g) if any changes are needed send these to the Provide PT Operator Interface for Fleet Control function in the confirm PT service change data flow
(h) as a result of (g) monitor for the receipt of the confirmed PT service change data flow and if when it arrives it contains a positive indication, implement the change to the services
(i) as part of (h) send details of the revised services to PT vehicles, PT stops and to functionality in the Manage Traffic Functional Area
(k) if the response in (h) is negative, repeat (f)
(l) analyse the current service performance and if priority is needed for selected PT vehicles, send the service number for priority and priority PT vehicle identity data flows to the Request Vehicle Priority function
(m) if as part of any of the above, changes are needed to the services provided by other transport modes then send the other mode service change request data flow to the Provide Interface to Other Modes function
(n) as a result of (m) continuously monitor for the receipt of the other mode service change response data flow
(o) when the data flow in (n) is received, implement (i) with the details of any service changes
(p) continuously monitor for the receipt of the service change request from other mode data flow
(q) when the data flow in (p) is received, determine whether or not the changes can be accommodated and if so repeat (g) to (i), except that if the response is negative repeat the first part of this instruction
(r) if the response received in (q) was positive sent the service change response to other modes data flow to the Provide Interface to Other Modes function
(s) if necessary for any of the above, send the request other mode service details data flow to the Provide Interface to Other Modes function and wait for receipt of a response in the other mode services data flow
(t) if the control parameters data flow is received from another instance of the function, store its contents for local use in those of the above instructions that are appropriate.
Diagrams
Parent Higher Level Function
Input logical dataflows
Output logical dataflows
User needs
Number | Description |
| The system shall provide effective and attractive PT. |
| The system shall be able to manage one or more modes of PT. |
| The system shall be able to identify an incident and make arrangements for the care for the passengers. |
| The system shall be able to schedule PT operations dynamically so that incidents or unexpected events can be handled with the minimum disruption. |
| The system shall be able to select those vehicles that need to be given priority and communicate the requests to the TCC. |
| The system shall be able to measure the effect of a strategy, and to modify it when necessary. |