Low Level Function
5.13.12 Monitor Vehicle Safety Behaviour

Overview

This Function shall be capable of providing the following facilities:

(1) The ability to monitor the safety behaviour of the Vehicle.
(2) The ability to receive data about the current location of the Vehicle, its speed and position, plus the legal and recommended speed limits for the road section that it is currently using.
(3) The ability to use this data to determine whether or not the Vehicle is being driven in a safe manor.
(4) The ability to consider unsafe behaviour to be such things as excessive speed and swerving from one lane to another.
(5) It is determined that the Vehicle is being driven in an unsafe manor the ability to send a warning for display to the Driver and an indication of bad safety behaviour to the functionality that collects FCD/XFCD so that this data is not used to calculate traffic conditions.

Functional Requirements

(a) continuously monitor for the receipt of the input data flows
(b) when the data flows containing actual, recommended and legal speeds are received in (a) determine if the vehicle is being driven such that it is exceeding any of the speed limits
(c) when the data flow containing the vehicle position is received in (a) compare it with the previous position and the speed to see if the vehicle is being driven in an unsafe manor
(d) if either of (b) or (c) results in the vehicle being found to be driven in an unsafe manor, i.e. exhibiting poor safety behaviour, send a warning indication for display to the driver in the safety behaviour status for display data flow
(e) in addition to (d) also send poor safety behaviour warnings in the safety behaviour status for urban and safety behaviour status for inter-urban data flows.

Diagrams

The Diagram(s) is (are) the diagram(s) where you can find the function :
  • DFD 5.13 Provide Vehicle Data and ISA
  • Functional Tree of Area 5

    • Parent Higher Level Function

    Input logical dataflows

    Output logical dataflows

    User needs

    Number

    Description

    7.4.4.15
    The system shall be able to warn the driver, via an in-vehicle device, that the host vehicle is exceeding the maximum speed limit.
    7.4.5.5
    The system shall be able to warn the driver, via an in-vehicle device, that the host vehicle is violating the minimum headway.
    7.4.6.25
    The system shall be able to provide a warning to the driver, via an in-vehicle display, that other vehicles behind are behaving in a dangerous manner (e.g. over speed limit, below minimum headway).