Low Level Function
3.1.2.9 Output Inter-urban Traffic Data

Overview

This Function shall be capable of providing the following facilities:

(1) The ability to periodically receive data about current traffic conditions in the inter-urban road network from the functionality that manages the store of Inter-urban Traffic Data, plus the functionality that manages lane use and maximum speeds within the inter-urban road network.
(2) The ability to immediately output the data which has been received to other parts of the System or to entities that are outside of the System.
(3) When a request is received from the Broadcaster entity, the ability to output the latest set of data that is available about inter-urban traffic conditions.

Functional Requirements

(a) continuously monitor for the receipt of the any of the input data flows
(b) when the data flow inter-urban traffic information request is received in (a), output the current traffic information to the broadcaster using the data flow containing inter-urban traffic data
(c) when the inter-urban traffic data for output data flow is received in (a), store its contents locally updating any previously received data that has been changed
(d) when (c) is complete, output the revised version of the inter-urban traffic data to functionality in other Functional Areas, the broadcaster and the traffic and travel information provide in the appropriate output data flows
(e) when either the inter-urban lane instructions or the inter-urban speed limit changes data flows are received in (a), repeat (c) and (d) for the data that they contain.

Diagrams

The Diagram(s) is (are) the diagram(s) where you can find the function :
  • DFD 3.1.2 Provide Inter-urban Traffic Management
  • Functional tree 3.1

    • Parent Higher Level Function

    Input logical dataflows

    Output logical dataflows

    User needs

    Number

    Description

    2.1.1.1
    The system shall be able to produce information for travellers on the traffic and travel conditions of all relevant transport modes.
    6.1.2.6
    The system shall be able to provide road and traffic information adapted to different classes of users, e.g. travellers, radio broadcasters, service operators.
    6.2.2.9
    The system shall be able to adapt the information to different classes of users, e.g. travellers, radio broadcasters, service operators.
    7.1.0.9
    The system shall ensure that traveller information service providers are aware of the traffic management strategy, so that they can provide information that conforms to it.
    7.4.1.33
    Traffic Queue Detection - The system shall be able to locate the tail end of a traffic queue and estimate its speed of propagation.
    7.5.1.28
    The system shall enable the TCC to inform traveller information service providers of the current traffic management strategy.
    7.6.2.4
    The system shall enable the traveller information service provider to receive current inter-urban traffic management, and weather, conditions and planned events.
    7.6.2.5
    The system shall enable the traveller information service provider to be provided with current an predicted inter-urban traffic conditions.