Low Level Function
6.5.3.8 Collect Data About Road Traffic

Overview

This Function shall be capable of providing the following facilities:

(1) The ability to collect road based travel data for use in the preparation of trip plans for Travellers, as well as for Freight and Emergency Vehicles.
(2) The ability to collect the data as it arrives from functionality in the Manage Traffic Functional Area.
(3) The ability to load the collected data into the store of Road Trip Planning Data and to manage all of the data in that store.

Functional Requirements

(a) continuously monitor for the receipt of the data flows from functionality in the Manage Traffic Functional Area
(b) when any of the data flows in (a) arrive, their contents shall be immediately loaded into the store of Road Trip Planning Data and fused with any data that is already present to provide a coherent set of current and historic traffic data
(c) if the road network traffic predictions data flow is not received, predicted travel time data for every segment of the road network shall be calculated based on the current and historic travel data received in the other data flows
(d) the results from (c) shall be loaded into the store of Road Trip Planning Data to take the place of the data that would have been received in the road network traffic predictions data flow
(e) the journey time data from (b) or (d) shall be sent to the Other Navigation Device in the data flow containing traffic data
(f) continuously monitor for the receipt of traffic data from the Other Navigational Device in the data flow containing traffic data
(g) when the data flow in (f) is received, load the data it contains into a separate part of the store of Road Trip Planning Data that is reserved for data from Other Navigation Devices.

Diagrams

The Diagram(s) is (are) the diagram(s) where you can find the function :
  • DFD 6.5.3 Trip Planning
  • Functional Tree of Area 6

    • Parent Higher Level Function

    Input logical dataflows

    Output logical dataflows

    User needs

    Number

    Description

    6.1.2.13
    The system shall be able to provide information to travellers so as to influence their choice of destination and/or mode of travel, e.g. to protect the environment of a "Point of Interest", or geographic area.
    6.1.2.4
    The system shall be able to support a database of events with links between events that occur concurrently and at the same or adjacent locations.
    6.1.2.5
    The system shall be able to analyse, process and retrieve data from different combinations of sources (including floating car).
    6.2.0.3
    The system shall be able to be activated automatically by another system, e.g. traffic management.
    6.2.0.4
    The system shall provide traffic information to the traveller during his/her trip in a timely manner, and include travel conditions, accidents, special events, car park status, etc.
    6.2.2.10
    The system shall be able to collect data from a variety of different sources, e.g. road/traffic management, police, weather services, floating car etc.
    6.2.2.3
    The system shall be able to provide cyclists and pedestrians with information about suitable routes.
    6.2.2.5
    The system shall be able to provide information to all drivers including route restrictions, travel times, etc.
    6.2.2.7
    The system shall be able to support a database of events with links between events that occur concurrently and at the same or adjacent locations.
    6.2.3.3
    The system shall provide information in the native language at the output location, and/or from a user selected choice of other appropriate foreign languages, when applicable.
    6.2.3.4
    The system shall provide information using "open" standard communication protocols.
    6.4.1.1
    The system shall be able to provide guidance to Car Parks (with parking spaces).
    6.4.1.3
    The system shall be able to compute the total predicted journey time over the route selected.
    6.4.1.4
    The system shall be able provide customised navigation information to the destination using a variety of selection criteria.
    7.3.4.1
    The system shall be able to provide information to promote the use of cycles and walking.
    7.5.1.24
    The system shall be able to calculate a predicted time for a total journey made up from separate links.  The predicted time shall be updated regularly as the time for each link changes.
    7.5.1.27
    The system shall be able to provide current and predicted journey times to another navigation device via an open interface (to enable dynamic navigation on the other device).