Low Level Function
1.5.5 Block Access to Service

Overview

This Function shall be capable of providing the following facilities:

(1) The ability to control the access of a user (Traveller or Driver) to the requested service.
(2) Upon detection of a violation, the ability to send a message to the access violations detection functionality.
(3) If an accident has been detected, the ability to send a warning to functionality in the Manage Traffic Functional Area.
(4) The ability to let the user proceed upon receipt of an agreement message from the violation detection functionality.
(5) A HMI through which the user can be informed about whether or not access to the requested service has been granted.

Functional Requirements

(a) upon reception of a message indicating a violation, prevent the user from using a service
(b) upon reception of a "free" command, allow the user to proceed
(d) send a warning message to the manage traffic area

Diagrams

The Diagram(s) is (are) the diagram(s) where you can find the function :
  • DFD 1.5 Control Fraud
  • Functional Tree of Area 1

    • Parent Higher Level Function

    Input logical dataflows

    Output logical dataflows

    User needs

    Number

    Description

    4.1.1.1
    The system shall have a minimum impact on the traffic flow, e.g. a short transaction duration.
    4.1.1.3
    The system shall not do anything to reduce the safety of either the travellers in the vehicle, or the staff close to the equipment, e.g. in toll booths.
    4.1.3.1
    The system shall be able to exchange financial information between roadside equipment (e.g. toll collection unit) and a moving traveller (e.g. a vehicle).
    4.1.4.1
    The system shall be able to be able to collect evidence on the non-payment of tolls, and other illegal financial transactions.
    4.1.4.2
    The system shall be able to collect evidence of unauthorised access when payment has not been received.