Low Level Function
3.1.2.13.5 Manage Inter-urban Traffic Commands & Messages

Overview

This Function shall be capable of providing the following facilities:

(1) The ability to provide traffic control facilities that enable the traffic to be managed so that the most efficient use is made of the inter-urban road network.
(2) The ability to manage the implementation of traffic management strategies for the inter-urban road network in a planned sequence according to the time of day and day of week.
(3) The ability for the traffic management strategies to include control of access to the inter-urban network (ramp metering), plus commands to manage the use of lanes in the carriageway (including the hard shoulder) and the maximum speeds for vehicles in each lane.
(4) The ability for these strategies to be overridden by the Road Network Operator through the functionality providing their interface, as well as by inputs from the incident, demand and access management functionality.
(5) The ability to use current, historic and predicted traffic data from the inter-urban network and to change in real-time the actual traffic management commands being sent for output to take account of variations in this data.
(6) The ability to provide details of the current and previous implemented traffic management strategies on some or all parts of the inter-urban road network to the Road Network Operator through the functionality that provides their interface.

Functional Requirements

(a) continuously monitor for receipt of any of the input data flows
(b) when the planned inter-urban traffic management request data flow is received in (a), action the strategy that it contains, by sending all or part of its contents in the inter-urban tunnel inputs, inter-urban bridge inputs, inter-urban crossing inhibit, inter-urban strategy details, inter-urban strategies in use, inter-urban strategy details for ramp metering, inter-urban zone access vehicle list, inter-urban lane management requests, inter-urban speed and headway settings, or inter-urban traffic management strategy, inter-urban to urban traffic commands data flows
(c) when the data flow containing inter-urban static data is received in (a), store its contents for internal use
(d) when the inter-urban zoning strategy data flow is received in (a), output its contents to the Check Access to Inter-urban Zones function in the inter-urban zone access vehicle list data flow
(e) when any of the bridge inter-urban inputs, tunnel inter-urban inputs, inter-urban environmental inputs, or inter-urban demand management strategy data flows are received in (a), use their contents to modify the current traffic management strategy, and repeat (b)
(f) when the data flow containing predicted inter-urban network data is received in (a), store its contents for internal use in calculateing recommended rroutes and send these in the inter-urban recommended routes data flow to the Plan Trip Details function
(g) when either of the urban to inter-urban commands, or inter-urban traffic management strategy data flows are received in (a), use their contents to modify the current traffic management strategy, and repeat (b)
(h) when the operator inter-urban management request data flow is received in (a), use their contents to modify the current traffic management strategy, repeat (b) and output the response to the Provide Inter-urban Road Operator Mgt Interface function in the operator inter-urban management response data flow.

Diagrams

The Diagram(s) is (are) the diagram(s) where you can find the function :
  • DFD 3.1.2.13 Manage Inter-urban Traffic Strategies
  • Functional tree 3.1

    • Parent Higher Level Function

    Input logical dataflows

    Output logical dataflows

    User needs

    Number

    Description

    2.1.2.2
    The system shall be able to develop and implement traffic environmental management strategies based on current and predicted traffic conditions.
    7.1.0.11
    The system shall be able to manage traffic in all or part of the road network using a methodology that is appropriate for motorways, e.g. no junctions and pedestrian facilities, but with lane use management.
    7.1.0.12
    The system shall be able to use different methodologies to control separate areas of the road network.
    7.1.0.13
    The system shall be able to manage the urban/inter-urban interface.
    7.1.0.2
    The system shall be able to implement identified control strategies that conform with specified policy.
    7.1.0.4
    The system shall manage road traffic in such a way that levels of environmental (i.e. atmospheric and noise) pollution may be reduced.
    7.1.0.5
    The system shall manage road traffic in such a way that congestion (travel time) may be reduced.
    7.1.0.6
    The system shall be able to help co-ordinate the activities of TICs and TCCs.
    7.1.4.1
    The system shall be able to control the entries and exits to motorways.
    7.1.4.8
    The system shall be able to provide co-ordinated traffic management operations during periods of mass movement across (many) regions.
    7.1.4.9
    The system shall be able to provide specific traffic management for exceptional vehicles (e.g. very dangerous cargo, wide loads, etc.).
    7.1.5.1
    The system shall be able to provide control measures to protect road maintenance work and workers.
    7.1.5.5
    The system shall be able to close roads and advise drivers of a suitable diversionary route for a period of time.
    7.1.5.7
    The system shall be able to recommend re-routing strategies to reduce congestion.
    7.1.5.8
    The system shall request confirmation of all exceptional measures before they are executed.
    7.1.5.9
    The system shall be able to recommend re-routing strategies to reduce atmospheric pollution.
    7.4.5.1
    The system shall enable the TCC to calculate recommended headways for the current traffic and environment conditions.
    7.5.1.10
    The system shall enable the service provided to the traveller to be passed from one TCC to another as the traveller moves from one area of coverage to another.
    7.5.1.4
    The system shall be able to monitor the current inter-urban traffic and weather/environmental conditions for the road network and recommend and/or set an appropriate traffic management strategy.
    7.5.1.5
    The system shall be able to manage the traffic in an area using a number of local semi-autonomous traffic management units, whose rules can be modified when required.