Low Level Function
3.1.1.5.20 Output c&i to Drivers using Urban Roads

Overview

This Function shall be capable of providing the following facilities:

(1) The ability to collect information for output to Drivers, Cyclists and Pedestrians from some or all of other functionality in the Manage Traffic Functional Area, functionality in the Provide Advanced Driver Assistance Functional Area and input from the Multi-Modal Crossings Actor.
(2) The output of consistent and coherent information and/or commands to Drivers using the urban road network.
(3) The ability for the outputs to be used to provide such things as, journey time information, commands for unexpected speed or lane use, weather condition and road surface warnings, etc.
(4) The output of warning messages about the activity of a particular Vehicle will include its identity.
(5) The ability to output data containing information and/or warning messages plus commands to other functionality for subsequent output to Vehicles as they pass by.
(6) The ability of the outputs to make use of different display technologies, other than those in the Vehicle.
(7) The monitoring of its operation and the reporting of any abnormalities to Maintenance Management functionality.
(8) The reporting of a fault to the Maintenance Management facility if a Vehicle reports that what is being output by the Function is not the same as what is being received in the Vehicle.

Functional Requirements

(a) when the urban traffic management c&i request data flow is received from the Urban Traffic Control function, its contents shall be implemented
(b) the implementation required in (a) shall be achieved through the output of the data flows to drivers, cyclists and pedestrians
(c) the response to (b) shall be sent to the Urban Traffic Control function using the msg response data flow
(d) if the response from (b) is that the data flows have not been output, data shall be sent to the Maintenance Management functionality using the c&i equipment fault data flow, and a device failed indication in the urban device status and urban traffic management c&i response data flows
(e) when the incident warning messages or urban crossing information data flows are received, they shall be implemented as in (b) to (d) above
(f) when the urban c&i display error data flow is received, check its contents to see if a difference has been found
(g) if a difference has been found in (f) then send a device failed indication to the Evaluate Need for Equipment Maintenance function in the urban c&i equipment fault data flow and to the Implement Urban Traffic Commands function in the urban traffic management c&i response data flow
(h) when any of the roadside vehicle lane departure warning, other vehicle lane departure warning, possible conflicts with vehicle movement, traffic queue ahead warning and advice, slow objects warning and advice, stationary emergency vehicle ahead warning data flows are received, or output the data that it includes in the host vehicle driver warning messages data flow to the driver and if it is included with the data, output the identity of the vehicle to which the warning applies
(i) send the data in (h) to the Output Message Data to Following Vehicles function in the data for output to following vehicles data flow
(j) the content of all of the outputs shall be monitored and if necessary revised to ensure that they are consistent and coherent.

Diagrams

The Diagram(s) is (are) the diagram(s) where you can find the function :
  • DFD 3.1.1.5 Provide Urban Traffic Management Faciliti
  • Functional tree 3.1

    • Parent Higher Level Function

    Input logical dataflows

    Output logical dataflows

    User needs

    Number

    Description

    6.2.3.8
    The system shall be able to provide road and traffic information using road-side equipment, e.g. VMS.
    7.1.0.2
    The system shall be able to implement identified control strategies that conform with specified policy.
    7.1.0.3
    The system shall not do anything to reduce road safety.
    7.1.0.5
    The system shall manage road traffic in such a way that congestion (travel time) may be reduced.
    7.1.3.4
    The system shall be able to activate control devices (e.g. traffic lights, VMS), either individually or in groups.
    7.4.1.30
    Motorcycle Warning - The system shall be able to detect that the host motorcycle has fallen onto the road pavement, and send this information to a road-side device.
    7.4.1.34
    Traffic Queue Detection - The system shall be able to inform drivers, via in-vehicle and road-side devices, of slow moving obstacles (e.g. person, animal, slow vehicle) and advise on the appropriate action (e.g. speed and lane).
    7.4.1.37
    Hazardous Location Notification - The system shall be able to warn driver, via an in-vehicle device, of adverse driving conditions ahead (e.g. slippery road, low visibility, queuing traffic) and advise on the appropriate action (e.g. speed).
    7.4.1.38
    Hazardous Location Notification - The system shall be able to warn drivers, via a road-side device, of adverse driving conditions ahead (e.g. slippery road, low visibility, queuing traffic) and advise on the appropriate action (e.g. speed).
    7.4.1.41
    Hazardous Location Notification - The system shall be able to inform drivers, via an in-vehicle device, of obstacles in the carriageway and advise on the appropriate action (e.g. speed and lane).
    7.4.1.42
    Hazardous Location Notification - The system shall be able to inform drivers, via road-side devices, of obstacles in the carriageway and advise on the appropriate action (e.g. speed and lane).
    7.4.1.46
    Hazardous Location Notification - The system shall be able to estimate the condition of the road surface in the vicinity of the host vehicle and send warnings to a road-side device.
    7.4.3.10
    The system shall be able to send to following vehicles "copies" of the traffic signs, or information about the local traffic (e.g. sudden congestion), that it may be useful to receive in advance.
    7.4.3.9
    The system shall provide "copies" of the traffic signs that are relevant to the current section of the road (e.g. speed limit, road hazards, junctions) to the driver at all times via an in-vehicle display.
    7.4.6.10
    The system shall be able to compare the current trajectory of a vehicle with the road geometry and send a warning to the drivers of other vehicles that might be affected, via a road-side device, that an oncoming vehicle lane departure into their lane is imminent.
    7.4.6.18
    The system shall be able to use a road-side device to warn drivers of any collisions that could occur with other vehicles and/or VRU that are approaching an urban intersection.
    7.4.6.8
    The system shall be able to compare the current trajectory of a vehicle with the road geometry and send a warning to the driver, via a road-side device, that it is about to depart its lane.
    7.4.7.2
    The system shall be able to warn the driver, via an in-vehicle device, that a VRU has been detected in a dangerous location by a system on the host vehicle.
    7.4.8.2
    The system shall enable drivers to be warned, via a road-side device, that there are one, or more, stationary assistance/emergency vehicles ahead of them.
    7.4.8.9
    The system shall enable the driver of the host vehicle to be advised, via an in-vehicle device, not to enter a zone defined by virtual cones.
    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.